NEET Biology Principle Of Inheritance And Variation Question Bank

done Critical Thinking Total Questions - 93

• question_answer1)
  Mendel's law were first published in the year
  A)
  1875 done clear
  B)
  1890 done clear
  C)
  1928 done clear
  D)
  1866 done clear
  View Solution play_arrow

• question_answer2)
  Escherichia coli is an important material for genetic experiments because [CPMT 1989]
  A)
  It is harmless done clear
  B)
  It is haploid done clear
  C)
  It can be easily cultured done clear
  D)
  Both [b] and [c] done clear
  View Solution play_arrow

• question_answer3)
  Which of the character is dominant in pea plant
  A)
  Wrinkled seeds containing tall plants done clear
  B)
  Red flower containing dwarf plant done clear
  C)
  Both [a] and [b] done clear
  D)
  Neither [a] nor [b] done clear
  View Solution play_arrow

• question_answer4)
  The segregation of paired hereditary factors that Mendel postulated occurs during [CBSE PMT 1993]
  A)
  Anaphase of first meiotic division done clear
  B)
  Metaphase of second meiotic division done clear
  C)
  During interphase between two meiotic divisions done clear
  D)
  Prophase of first meiotic division done clear
  View Solution play_arrow

• question_answer5)
  From a cross AABb × aaBb, the genotypes AaBB : AaBb : Aabb : aabb will be obtained in the following ratio [BHU 1994]
  A)
  1 : 1 : 1 : 1 done clear
  B)
  1 : 2 : 1 : 0 done clear
  C)
  0 : 3 : 1 : 0 done clear
  D)
  1 : 1 : 1 : 0 done clear
  View Solution play_arrow

• question_answer6)
  In an organism, pink spot is a sex-linked recessive trait and black hair is dominant to white. If a pink spotted black heterozygous female is mated to a white male which is not spotted, the phenotypic ratio of the offspring would be [JIPMER 1994]
  A)
  1/4 spotted black; 1/4 pink spotted white; 1/4 unspotted black; 1/4 unspotted white done clear
  B)
  1/2 pink spotted black; 1/2 pink spotted white done clear
  C)
  3/4 pink spotted black; 1/4 pink spotted white done clear
  D)
  3/4 unspotted black ; 1/4 pink spotted white done clear
  View Solution play_arrow

• question_answer7)
  In a certain plant, red flowers (R) are dominant to white flowers (r) and tallness (T) is dominant to dwarfness (t). A heterozygous plant (RrTt) is backcrossed with a double recessive plant (rrtt). If the gene loci for colour and size and situated very close together on the same chromosome, the expected percentage of offsprings could be approximately
  A)

  	tall red	tall white	dwarf red	dwarf white
  	25%	25%	25%	25%

  done clear
  B)

  49%,

  49%

  1%

  1%

  done clear
  C)

  49%

  1%

  1%

  49%

  done clear
  D)

  1%

  1%

  49%

  49%

  done clear
  View Solution play_arrow

• question_answer8)
  A tobacco plant which is heterozygous for albinism (a recessive character) is self-pollinated if 1200 seeds are subsequently germinated, how many of the seedlings would have the parental genotype [Manipal 1995]
  A)
  300 done clear
  B)
  600 done clear
  C)
  900 done clear
  D)
  1200 done clear
  View Solution play_arrow

• question_answer9)
  How many different types of gametes canbe formed by \[{{F}_{1}}\] progeny, resulting from the following cross: AA BB CC × aa bb cc [AIIMS 2004]
  A)
  3 done clear
  B)
  8 done clear
  C)
  27 done clear
  D)
  64 done clear
  View Solution play_arrow

• question_answer10)
  Probability of genotype TTrr in \[{{F}_{2}}\] generation of a dihybrid cross is [MH-CET 2004]
  A)
  \[\frac{1}{16}\] done clear
  B)
  \[\frac{3}{16}\] done clear
  C)
  \[\frac{9}{16}\] done clear
  D)
  \[\frac{6}{16}\] done clear
  View Solution play_arrow

• question_answer11)
  In case of incomplete dominance in \[{{F}_{2}}\] generation [BHU 1995]
  A)
  Genotypic ratio is 3 : 1 done clear
  B)
  Phenotypic ratio is 3 : 1 done clear
  C)
  Genotypic ratio = phenotypic ratio done clear
  D)
  Nothing can be concluded done clear
  View Solution play_arrow

• question_answer12)
  One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of  progenies that mutation is found in [CBSE PMT 2004]
  A)
  All the progenies done clear
  B)
  Fifty percent of the progenies done clear
  C)
  One-third of the progenies done clear
  D)
  None of the progenies done clear
  View Solution play_arrow

• question_answer13)
  When a cell with 40 chromosomes undergoes meiosis, each of the four resulting cells has [CPMT 1987; BHU 2001; CPMT 2003]
  A)
  20 chromosomes done clear
  B)
  40 chromosomes done clear
  C)
  80 chromosomes done clear
  D)
  10 chromosomes done clear
  View Solution play_arrow

• question_answer14)
  A recessive gene is one which
  A)
  Occurs less frequently than a dominant one done clear
  B)
  Occurs only in heterozygotes done clear
  C)
  Produces large amounts of RNA done clear
  D)
  Produces very less or no mRNA done clear
  View Solution play_arrow

• question_answer15)
  Chromosomal number in a cell of a flowering plant is [CPMT 1993]
  A)
  Only haploid done clear
  B)
  Only diploid done clear
  C)
  Many types done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer16)
  How many genome types are present in a typical green plants cell [CBSE PMT 1998]
  A)
  Two done clear
  B)
  Three done clear
  C)
  More than five done clear
  D)
  More than ten done clear
  View Solution play_arrow

• question_answer17)
  Polytene chromosomes in salivary glands of Drosophila are formed as a result of [Kerala PMT 2004]
  A)
  Endoduplication done clear
  B)
  Duplication without separation done clear
  C)
  Replication of DNA without cell division done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer18)
  In 1980, F. Sanger was awarded Nobel prize second time to be shared by Gilbert and Maxum for their work on [BHU 1989]
  A)
  Genetic mapping of chromosomes done clear
  B)
  Determining amino acid sequence of insulin done clear
  C)
  Determining base sequence of DNA of virus done clear
  D)
  Determining the structure of DNA done clear
  View Solution play_arrow

• question_answer19)
  Bacteria were grown in a medium containing heavy isotope of nitrogen (N15) for many generations and all their DNA contained many heavy nitrogen only. A bacterium of this type was transferred to normal medium and allowed to duplicate. After two divisions of heavy DNA is likely to be that [CBSE PMT 1993]
  A)
  Only one daughter cell will have heavy DNA done clear
  B)
  Two daughter cells have normal DNA and other two have both normal and heavy DNA done clear
  C)
  All daughter cells have heavy DNA done clear
  D)
  Half daughter cells have heavy DNA and other half have normal DNA done clear
  View Solution play_arrow

• question_answer20)
  DNA generally acts as template for the synthesis of [CPMT 1979, 87]
  A)
  Only protein done clear
  B)
  Only DNA done clear
  C)
  Only RNA done clear
  D)
  Both DNA and RNA done clear
  View Solution play_arrow

• question_answer21)
  Which RNA is having least age [MP PMT 2002]
  A)
  m RNA done clear
  B)
  t RNA done clear
  C)
  r RNA done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer22)
  Which type of RNA is most abundant in cell [Orissa PMT 2002]
  A)
  m RNA done clear
  B)
  t RNA done clear
  C)
  r RNA done clear
  D)
  catalytic RNA done clear
  View Solution play_arrow

• question_answer23)
  Which of the character is not applicable to t-RNA [Kerala CET 2003]
  A)
  It is the smallest of the RNAs done clear
  B)
  It acts as an adapter for amino acids done clear
  C)
  It has a clover leaf like structure done clear
  D)
  It is the largest of the RNAs done clear
  View Solution play_arrow

• question_answer24)
  tRNA is composed of about how many nucleotides
  A)
  50 to 55 done clear
  B)
  75 to 90 done clear
  C)
  92 to 98 done clear
  D)
  More than 100 done clear
  View Solution play_arrow

• question_answer25)
  RR (Red) is crossed with ww (white), all the Rw offsprings are pink. This is an indication that R gene is [CPMT 1974, 76, 81]
  A)
  Hybrid done clear
  B)
  Recessive done clear
  C)
  Incompletely dominant done clear
  D)
  Mutant done clear
  View Solution play_arrow

• question_answer26)
  In his experiments on the chemistry of DNA, Chargaff estimated the base composition of human sperms and found that Adenine constituted 31% and Guanine 19%. The quantity of Cytosine in the DNA of human somatic cell is likely to be [BHU 1991]
  A)
  31% done clear
  B)
  19% done clear
  C)
  38% done clear
  D)
  68% done clear
  View Solution play_arrow

• question_answer27)
   Which one of the following pairs is correctly matched [MP PMT 1993]
  A)
  Ribosomal RNA Carries amino acids to the site of protein synthesis done clear
  B)
  Transcription Process by which protein is synthesized done clear
  C)
  Translation Process by which m-RNA carries the information from the nucleus to ribosomes done clear
  D)
  Anticodon Site of a t-RNA molecule hydrogen bond that binds to the m-RNA molecule done clear
  View Solution play_arrow

• question_answer28)
  In DNA if 10% guanine is present, how much thymine is present [EAMCET 1993]
  A)
  10% done clear
  B)
  40% done clear
  C)
  80% done clear
  D)
  20% done clear
  View Solution play_arrow

• question_answer29)
   Which one of the following correctly represents the manner of replication of DNA   [AIIMS 2003]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer30)
  What function is performed by sigma factor and rho factor in the process of transcription
  A)
  Of initiation and termination done clear
  B)
  Of initiation and elongation done clear
  C)
  Of charging tRNA and elongation done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer31)
  Which of the following is a sulphur containing amino acid [CMC Vellore 1994]
  A)
  Alanine done clear
  B)
  Glycine done clear
  C)
  Methionine done clear
  D)
  Valine done clear
  View Solution play_arrow

• question_answer32)
  Consider the following 1. Structural gene 2. Messenger RNA 3. Ribosomes 4. Transcription 5. Translation Which of the following is the correct sequence for protein synthesis
  A)
  1, 4, 3, 2, 5 done clear
  B)
  1, 4, 5, 2, 3 done clear
  C)
  1, 4, 2, 3, 5 done clear
  D)
  3, 5, 4, 2, 1 done clear
  View Solution play_arrow

• question_answer33)
  RNA polymerase is involved in [CPMT 2003]
  A)
  Translation done clear
  B)
  Transcription done clear
  C)
  Translocation done clear
  D)
  Replication done clear
  View Solution play_arrow

• question_answer34)
  How many codes are blank
  A)
  One done clear
  B)
  Two done clear
  C)
  Three done clear
  D)
  Four done clear
  View Solution play_arrow

• question_answer35)
  Triplet for inhibiting process of translation is [CBSE PMT 1996]
  A)
  UAG done clear
  B)
  UAA done clear
  C)
  UAC done clear
  D)
  UGG done clear
  View Solution play_arrow

• question_answer36)
  E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source energy because [CBSE PMT 2005]
  A)
  In the presence of glucose, E.coli cells do not utilize lactose done clear
  B)
  They cannot transport lactose from the medium into the cell done clear
  C)
  The lac operon is constitutively active in these cells done clear
  D)
  They cannot synthesize functional betagalactosidase done clear
  View Solution play_arrow

• question_answer37)
  Which one of the following pair is correctly matched [MP PMT 1993]
  A)
  Van Helmont Discovered mutations done clear
  B)
  Louis Pasteur Wrote "The Origin of Species'' done clear
  C)
  T.H. Morgan Studied sex-linked inheritance done clear
  D)
  H. Khorana Studied DNA replication done clear
  View Solution play_arrow

• question_answer38)
  In Drosophila, long wing and broad abdomen characters are dominant over to characters vestigeal wing and narrow abdomen. A pure breeding Drosophila having long wings and broad abdomen is crossed with a pure breeding vestigeal-winged and narrow-abdomened Drosophila. Two of the \[{{F}_{1}}\]individuals were crossed and the following results were produced in the\[{{F}_{2}}\] generation Long wing, broad abdomen in 482 Drosophila. Vestigeal wing, narrow abdomen in 154 Drosophila. Which one of the following is illustrated by these results
  A)
  Autosomal linkage done clear
  B)
  Incomplete dominance done clear
  C)
  Mendelian monohybrid inheritance done clear
  D)
  Mendelian dihybrid inheritance done clear
  View Solution play_arrow

• question_answer39)
  When two genes are situated very close to each other in a chromosome [AIIMS 1980; AFMC 1994]
  A)
  The percentage of crossing over between them is very high done clear
  B)
  Hardly any cross over are detected done clear
  C)
  No crossing over can take place between them done clear
  D)
  Only double cross overs can take place between them done clear
  View Solution play_arrow

• question_answer40)
  Crossing over is
  A)
  Inversely related to linkage done clear
  B)
  Directly related to linkage done clear
  C)
  Similar in meaning to linkage done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer41)
  During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at the point. What is that sequence called [CBSE PMT 2005]
  A)
  CAAT box done clear
  B)
  GGTT box done clear
  C)
  AAAT box done clear
  D)
  TATA box done clear
  View Solution play_arrow

• question_answer42)
  Which of the following generally used for induced mutagenesis in crop plants [CBSE PMT 2005]
  A)
  Alpha particle done clear
  B)
  X-rays done clear
  C)
  UV (260 nm) done clear
  D)
  Gamma rays (from cobalt 60) done clear
  View Solution play_arrow

• question_answer43)
  Telocentric chromosome differs from acrocentric chromosome in that [AIIMS 1985]
  A)
  The former has a subterminal centromere whereas the later has a centrally located centrosome done clear
  B)
  The centromere in the former is terminal and in the later is subterminal done clear
  C)
  The former has a terminal centromere and the later has a medially located centromere done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer44)
  Frequency of crossing over in a chromosome is an index of
  A)
  Relative distance between its genes only done clear
  B)
  Structural affinity between its genes only done clear
  C)
  Strength linkage between its genes only done clear
  D)
  [a] and [b] both are correct done clear
  View Solution play_arrow

• question_answer45)
  The formation of a male child depends on the sperms because [CPMT 1992]
  A)
  Sperms may be X and Y done clear
  B)
  Sperms are all Y done clear
  C)
  The eggs from the other ovary may be Y done clear
  D)
  Sperms are more active done clear
  View Solution play_arrow

• question_answer46)
  Epistasis implies [AIIMS 1985]
  A)
  One pair of genes can completely mask the expression of another pair of genes done clear
  B)
  One pair of genes independently controls a particular phenotype done clear
  C)
  One pair of genes enhances the phenotype expression of another pair of genes done clear
  D)
  Many genes collectively control a particular phenotype done clear
  View Solution play_arrow

• question_answer47)
  If the number of chromosomes in most body cells of a mammal is 40, the cells in the seminiferous tubule will have [AFMC 1994]
  A)
  40 chromosomes done clear
  B)
  20 chromosomes done clear
  C)
  10 chromosomes done clear
  D)
  While some other will have 20 done clear
  View Solution play_arrow

• question_answer48)
  How many nucleosomes are found in helical coil of 30 nm chromatin fibre [RPMT PMT 2000]
  A)
  10 done clear
  B)
  12 done clear
  C)
  06 done clear
  D)
  09 done clear
  View Solution play_arrow

• question_answer49)
  Biological marriage of one of the following should be avoided [BHU 1982, 84, 85; AFMC 1984, 95, 2001; CPMT 1976, 84, 85, 90;] or After examining the blood groups of a couple, the doctor advised them not to have more than one child. The blood group of the couple are likely to be [AIIMS 1983; CBSE PMT 1990, 02; MP PMT 1990, 95, 2000, 03; AIEEE 2003]
  A)
  \[R{{h}^{+}}\]male and \[R{{h}^{-}}\]female done clear
  B)
  \[R{{h}^{+}}\]male and \[R{{h}^{+}}\] female done clear
  C)
  \[R{{h}^{-}}\]male and \[R{{h}^{+}}\] female done clear
  D)
  \[R{{h}^{-}}\]male and \[R{{h}^{-}}\] female done clear
  View Solution play_arrow

• question_answer50)
  A person meets with an accident and great loss of blood has occurred. There is no time to analyse his blood group. It is safe to transfer blood of group [AIIMS 1984; Orissa JEE 2005]
  A)
  \[AB,R{{h}^{+}}\] done clear
  B)
  \[AB,R{{h}^{-}}\] done clear
  C)
  \[O,R{{h}^{-}}\] done clear
  D)
  \[O,R{{h}^{+}}\] done clear
  View Solution play_arrow

• question_answer51)
  A pair of contrasting characters is termed as [AFMC 1984]
  A)
  Allelomorphs done clear
  B)
  Homozygous done clear
  C)
  Heterozygous done clear
  D)
  Polymorphs done clear
  View Solution play_arrow

• question_answer52)
  If a human mother has ?O' blood group, the foetus would die if the blood of foetus is [NCERT 1982]
  A)
  A done clear
  B)
  B done clear
  C)
  AB done clear
  D)
  Would remain unaffected by blood group whether it is A, B or AB done clear
  View Solution play_arrow

• question_answer53)
  Haemolytic jaundice is caused due to a dominant gene but only 10% of the people actually develop the disease. A heterozygous man marries a homozygous normal woman; what proportion of the children would be expected to develop the haemolytic disease [AIIMS 1982]
  A)
  1/5 done clear
  B)
  1/10 done clear
  C)
  1/15 done clear
  D)
  1/20 done clear
  View Solution play_arrow

• question_answer54)
  Marriages between close relatives and cousins is not advisable because [NCERT 1976; MP PMT 1990]
  A)
  More mutations can occur done clear
  B)
  More recessive defects are likely to appear done clear
  C)
  More chances are there for Rh blood group anomalies done clear
  D)
  More chances are there for multiple births done clear
  View Solution play_arrow

• question_answer55)
  In a medico-legal case of accidental interchange between two babies in a hospital, the baby of blood group A could not be rightly given to a people [MP PMT 1990]
  A)
  With both husband and wife of group O done clear
  B)
  Husband of group O and wife of group A done clear
  C)
  Husband of group A and wife of group O done clear
  D)
  Both husband and wife of group A done clear
  View Solution play_arrow

• question_answer56)
  When whole blood is stored with an anticoagulant at \[4{}^\circ C\], the \[{{K}^{+}}\]ions move out from the RBC into the plasma. The most likely reasons for this is that [AIIMS 1982; DPMT 1992]
  A)
  RBC haemolyses and hence leakage of \[{{K}^{+}}\]ions done clear
  B)
  \[{{K}^{+}}\] ions become more mobile at\[4{}^\circ C\] done clear
  C)
  Active transport ceases resulting in ionic equilibrium done clear
  D)
  The anticoagulant attracts the \[{{K}^{+}}\]ions into the plasma done clear
  View Solution play_arrow

• question_answer57)
  Between persons of which two blood groups is the blood transfusion not possible [MP PMT 1992]
  A)
  O and AB (AB recipient) done clear
  B)
  O and A (O donor) done clear
  C)
  O and B (O donor) done clear
  D)
  O and AB (AB donor) done clear
  View Solution play_arrow

• question_answer58)
  In man, brown eyes are dominant over blue and dark hair dominant over red hair . A man with brown eyes and red hair marries a woman with blue eyes and dark hair. They got two children; one resembling the man, the other the woman. The genotypes of the man and woman were
  A)
  BBdd, bbDD done clear
  B)
  Bbdd, bbDd done clear
  C)
  BBdd, bbDd done clear
  D)
  Bbdd, bbDD done clear
  View Solution play_arrow

• question_answer59)
  A child's blood group is 'O'. The parents blood groups cannot be [CBSE PMT 1994; Kerala PMT 2005]
  A)
  AB and O done clear
  B)
  B and O done clear
  C)
  A and B done clear
  D)
  A and A done clear
  View Solution play_arrow

• question_answer60)
  In man the mutation disease, aniridia (congenital absence of iris) occurs due to [BHU 1988]
  A)
  Dominant mutation done clear
  B)
  Recessive mutation done clear
  C)
  Lethal mutation done clear
  D)
  Iso-alleles done clear
  View Solution play_arrow

• question_answer61)
  A boy is colour blind, in his two sisters one is colour blind and one is carrier (normal). Then who is colour blind in his family [CPMT 1994]
  A)
  Father done clear
  B)
  His grandfather and mother done clear
  C)
  Mother done clear
  D)
  His grand father done clear
  View Solution play_arrow

• question_answer62)
  Arrangement of DNA has the triplet base sequence AAC GAC AGC GGC ACA AAA. Due to mutation, the first base only got deleted. Then the likely effect of this on the coding of the DNA segment is that [AIIMS 1980]
  A)
  The first amino acid will be different and all others will be like the earlier polypeptide done clear
  B)
  The polypeptide will have one amino acid less done clear
  C)
  There will be a complete change in the types and sequence of amino acid done clear
  D)
  There will be no change in the polypeptide chain formed done clear
  View Solution play_arrow

• question_answer63)
  In order to determine whether variations of a character in a population were genetically controlled, the most appropriate procedure will be to [AIIMS 1983]
  A)
  Count chromosomes and find out the variations in number in the population done clear
  B)
  Examine DNA and see if the population shows any variation done clear
  C)
  Measure the variations and see if they are continuous or discontinuous done clear
  D)
  Cross individuals of both extremes and see if the offsprings and parents show the same range of variations done clear
  View Solution play_arrow

• question_answer64)
  Knowing that albinism is determined by a recessive gene in man; presence of albinism in children born to a couple proves that [AIIMS 1992]
  A)
  Both the father and the mother are heterozygous for albinism done clear
  B)
  The father is homozygous normal but the mother is heterozygous or vice versa done clear
  C)
  The father is homozygous for albinism but the mother is heterozygous or vice versa done clear
  D)
  [a] and [c] are correct done clear
  View Solution play_arrow

• question_answer65)
  In Drosophila melanogaster, 3 pairs of autosomes and sex chromosomes of XO type give rise to a normal male in appearance. In man, 22 pairs of autosomes and XO type of sex chromosomes form [MP PMT 1994]
  A)
  Normal female done clear
  B)
  Normal male done clear
  C)
  Klinefelter's syndrome done clear
  D)
  Turner's syndrome done clear
  View Solution play_arrow

• question_answer66)
  A normal woman whose father was albino marries a man who is albino. What proportion of normal and albino can be expected among their offsprings [CBSE PMT 1994]
  A)
  1 normal : 1 albino done clear
  B)
  All albino done clear
  C)
  2 normal : 1 albino done clear
  D)
  All normal done clear
  View Solution play_arrow

• question_answer67)
  In man sometime during gametogenesis sex chromosomes are not separated themselves on account of which chromosome number becomes 45, 47 or 48. In this condition which of the following genotype and phenotype is correct
  A)
  22 pairs + XXY males done clear
  B)
  22 pairs + XX females done clear
  C)
  22 pairs + XXXY females done clear
  D)
  22 + Y females done clear
  View Solution play_arrow

• question_answer68)
  Transition type of gene mutation is caused when [MP PMT 1997]
  A)
  GC is replaced by TA done clear
  B)
  CG is replaced by GC done clear
  C)
  AT is replaced by CG done clear
  D)
  AT is replaced by GC done clear
  View Solution play_arrow

• question_answer69)
  Euploidy is best explained by [Pb. PMT 1999]
  A)
  Exact multiples of a haploid set of chromosomes done clear
  B)
  One chromosome less than the haploid set of chromosomes done clear
  C)
  One chromosome more than the haploid set of chromosomes done clear
  D)
  One chromosome more than the diploid set of chromosomes done clear
  View Solution play_arrow

• question_answer70)
  Match list I with List II and select the correct answer using code given below [MP PMT 2001] List I (syndrome) (1) Patau's syndrome (2) Kline-Felter's syndrome (3) Down's syndrome (4) Turner's syndrome List II (Chromosomal abnormality) 44 + XXY = 47 44 + X = 45 46 + 1 = 47, Chromosome 13th 46 + 1 = 47, Chromosome 21st Code
  A)
  \[\overset{1}{\mathop{A}}\,\,\,\overset{2}{\mathop{B}}\,\,\,\overset{3}{\mathop{C}}\,\,\,\overset{4}{\mathop{D}}\,\] done clear
  B)
  \[\overset{1}{\mathop{D}}\,\,\,\overset{2}{\mathop{C}}\,\,\,\overset{3}{\mathop{B}}\,\,\,\overset{4}{\mathop{A}}\,\] done clear
  C)
  \[\overset{1}{\mathop{C}}\,\,\,\overset{2}{\mathop{B}}\,\,\,\overset{3}{\mathop{D}}\,\,\,\overset{4}{\mathop{A}}\,\] done clear
  D)
  \[\overset{1}{\mathop{C}}\,\,\,\overset{2}{\mathop{A}}\,\,\,\overset{3}{\mathop{D}}\,\,\,\overset{4}{\mathop{B}}\,\] done clear
  View Solution play_arrow

• question_answer71)
  The process of genetic mutation is [MP PMT 2002]
  A)
  Reversible done clear
  B)
  Irreversible done clear
  C)
  Partially reversible done clear
  D)
  Continuous done clear
  View Solution play_arrow

• question_answer72)
  If gene exchange rate is 30% of the two linked genes, then the distance between these two genes is
  A)
  30 unit done clear
  B)
  15 unit done clear
  C)
  60 unit done clear
  D)
  45 unit done clear
  View Solution play_arrow

• question_answer73)
  The primary biological importance of sex in organisms is that it [MP PMT 1990]
  A)
  Is essential for organismic reproduction done clear
  B)
  Is essential for cellular reproduction done clear
  C)
  Causes new mutations to occur in offspring done clear
  D)
  Promotes genetic variability in offspring done clear
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• question_answer74)
  Identical twins are produced when [BHU 1982; MP PMT 2001]
  A)
  One fertilized egg divided into 2 blastomeres and both separate done clear
  B)
  One sperm fertilizes two eggs done clear
  C)
  One egg fertilized with two sperms done clear
  D)
  Two eggs are fertilized done clear
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• question_answer75)
  Which of the following correctly defines a transgenic animal [CBSE PMT 1995]
  A)
  An animal which has foreign DNA and RNA in some of its cells because of an injection of DNA and RNA into the nucleus of the zygote from which it is developed done clear
  B)
  An animal which has foreign DNA in all its cells because of an injection of DNA into the nucleus of the zygote from which it is developed done clear
  C)
  An animal which has foreign DNA in some of its cells because of an injection of DNA into the nuclei of some of the cells of the blastocyst done clear
  D)
  An animal which has foreign DNA in all its cells because of an injection of DNA into the nuclei of some of the cells in adulthood done clear
  View Solution play_arrow

• question_answer76)
  Each chromosoxme at the anaphase stage of a bone marrow cell in our body has [CBSE PMT 1995]
  A)
  Two chromatids done clear
  B)
  No chromatids done clear
  C)
  Only one chromatid done clear
  D)
  Several chromatids done clear
  View Solution play_arrow

• question_answer77)
  Primary source of allelic variation is [AIIMS 2005]
  A)
  Independent assortment done clear
  B)
  Recombination done clear
  C)
  Mutation done clear
  D)
  Polyploidy done clear
  View Solution play_arrow

• question_answer78)
  Which one of the following is a correct statement [AIIMS 2005]
  A)
  "Bt" in "Bt-cotton" indicates that it is a genetically modified organism produced through biotechnology done clear
  B)
  Somatic hybridization involves fusion of two complete plant cells carrying desired genes done clear
  C)
  The anticoagulant hirudin is being produced from transgenic Brassica napus seeds done clear
  D)
  "Flavr Savr" variety of tomato has enhanced the production of ethylene which improves its taste done clear
  View Solution play_arrow

• question_answer79)
  In a trihybrid cross which plant will produce eight types of gametes
  A)
  Any plant of \[{{F}_{1}}\] generation done clear
  B)
  25% plants of \[{{F}_{1}}\] generation done clear
  C)
  Recessive plant of \[{{F}_{1}}\] generation done clear
  D)
  Any plant except a plant of \[{{F}_{1}}\]  generation done clear
  View Solution play_arrow

• question_answer80)
  In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype [CBSE PMT 2005]
  A)
  aaBB done clear
  B)
  AaBb done clear
  C)
  AABB done clear
  D)
  aabb done clear
  View Solution play_arrow

• question_answer81)
  As a result of marriage of curly hair mother and straight hair father, 8 children are born. The ratio of curly and straight haired will be [CPMT 1980; MP PMT 2001]
  A)
  6 : 2 done clear
  B)
  2 : 6 done clear
  C)
  4 : 4 done clear
  D)
  3 : 5 done clear
  View Solution play_arrow

• question_answer82)
  A woman of blood group 'O' presented a baby of blood group 'O' which she claimed as her child. She brought a suit against a man of `AB' group as the father of the child. Which statement is correct as per your judgement [MP PMT 1994]
  A)
  The father and mother claimed are the true persons done clear
  B)
  Father is true and mother is not the true person done clear
  C)
  Both the parentage claims are false done clear
  D)
  Mother is the true person and father claimed is not true done clear
  View Solution play_arrow

• question_answer83)
  A man with blood group 'AB' marries a woman with 'O' blood group. In this situation [MP PMT 1994]
  A)
  The blood groups of their children will be the same as that of the mother done clear
  B)
  The blood group of the children differs from both the parents done clear
  C)
  While 50% of children will have father's blood group, the remaining will have mother's blood group done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer84)
  Pure homozygous offsprings in a dihybrid cross in the  generation will be
  A)
  1/2 done clear
  B)
  1/4 done clear
  C)
  1/8 done clear
  D)
  1/16 done clear
  View Solution play_arrow

• question_answer85)
  Identify the following point mutations in mRNA : UAU  ACC  UAU  to  UAU  AAC  CUA  and  UUG CUA  AUA  to UUG  CUG  AUA [JIPMER 1993]
  A)
  Transition and frame shift respectively done clear
  B)
  Transversion and frame shift respectively done clear
  C)
  Frame shift and transversion respectively done clear
  D)
  Frame shift and transition respectively done clear
  View Solution play_arrow

• question_answer86)
  Initiating codon in eukaryotes is [CBSE PMT 1999; MP PMT 1997; BVP 2002, 04; DPMT 2003; BHU 2004; Kerala PMT 2004]
  A)
  AUG done clear
  B)
  GUG done clear
  C)
  UGA done clear
  D)
  UAG done clear
  View Solution play_arrow

• question_answer87)
  The mule is a [NCERT 1973]
  A)
  Hybrid done clear
  B)
  Out cross done clear
  C)
  Species done clear
  D)
  Vigour hybrid done clear
  View Solution play_arrow

• question_answer88)
  A black dog heterozygous for the colour is crossed with white bitch, recessive homozygous. Progeny will show black to white offsprings in the ratio of [DPMT 1983]
  A)
  All black done clear
  B)
  All albino done clear
  C)
  1 : 1 done clear
  D)
  3 : 1 done clear
  View Solution play_arrow

• question_answer89)
  Recessive characters are expressed [AFMC 1995]
  A)
  Only when they are present on X chromosomes of male done clear
  B)
  Only when they are present on X chromosomes of female done clear
  C)
  On any autosome done clear
  D)
  On both the chromosomes of female done clear
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• question_answer90)
  Persons with the following syndrome have a tendency of tall structure, mental defects and a strong antisocial behaviour [KCET 1994]
  A)
  XYY syndrome done clear
  B)
  Down's syndrome done clear
  C)
  Klinefelter's syndrome done clear
  D)
  Turner's syndrome done clear
  View Solution play_arrow

• question_answer91)
  The exchange of one part of a chromosome to the other part of same or another chromosome is called [AFMC 2002]
  A)
  Inversion done clear
  B)
  Mutation done clear
  C)
  Translocation done clear
  D)
  Linkage done clear
  View Solution play_arrow

• question_answer92)
  A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is [CBSE PMT 1990]
  A)
  25% done clear
  B)
  50% done clear
  C)
  75% done clear
  D)
  0% done clear
  View Solution play_arrow

• question_answer93)
  When a cluster of genes shows linkage behaviour they [CBSE PMT 2003]
  A)
  Induce cell division done clear
  B)
  Do not show a chromosome map done clear
  C)
  Show recombination during meiosis done clear
  D)
  Do not show independent assortment done clear
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