12th Class Biology Principle Of Inheritance And Variation Question Bank

done Case Based - Principles of Inheritance and Variation Total Questions - 30

• question_answer1)

  Direction Read the following and answer the questions from given below Mendel is known as the 'Father of Genetics' because of his ground breaking work on inheritance in pea plants 150 years ago. At the age of 21 Mendel while working in a monastery in Brunn (now in the Czech Republic) began a series of experiments in their botanical garden. He found out how traits are passed from one generation to another, i.e. inheritance. He studied this in peas [Pisum satwum) because they are easy to grow and can be shown each year.

  (i) During the experiments, Mendel called genes by the term

   
  A)
  traits                done clear
  B)
  characters done clear
  C)
  factors          done clear
  D)
  qualities done clear
  View Solution play_arrow

• question_answer2)

  Direction Read the following and answer the questions from given below Mendel is known as the 'Father of Genetics' because of his ground breaking work on inheritance in pea plants 150 years ago. At the age of 21 Mendel while working in a monastery in Brunn (now in the Czech Republic) began a series of experiments in their botanical garden. He found out how traits are passed from one generation to another, i.e. inheritance. He studied this in peas [Pisum satwum) because they are easy to grow and can be shown each year.

  (ii) Under which topic, Mendel's work was published in 'Natural History Society of Brunn'?

  A)
  Mendel's Laws of Inheritance done clear
  B)
  Experiments in Plant Hybridisation done clear
  C)
  Experiment on Heredity and Variation done clear
  D)
  Origin of Species done clear
  View Solution play_arrow

• question_answer3)

  Direction Read the following and answer the questions from given below Mendel is known as the 'Father of Genetics' because of his ground breaking work on inheritance in pea plants 150 years ago. At the age of 21 Mendel while working in a monastery in Brunn (now in the Czech Republic) began a series of experiments in their botanical garden. He found out how traits are passed from one generation to another, i.e. inheritance. He studied this in peas [Pisum satwum) because they are easy to grow and can be shown each year.

  (iii) Mendel was lucky to work on pea plants for his experiment because

  A)
  pea flowers are normally self-pollinated, but can be readily cross-pollinated done clear
  B)
  there are several varieties in peas with observable alternative form of a trait done clear
  C)
  the selected seven characters in the experiment are located on the same chromosome done clear
  D)
  the selected seven characters were located on different chromosomes done clear
  View Solution play_arrow

• question_answer4)

  Direction Read the following and answer the questions from given below Mendel is known as the 'Father of Genetics' because of his ground breaking work on inheritance in pea plants 150 years ago. At the age of 21 Mendel while working in a monastery in Brunn (now in the Czech Republic) began a series of experiments in their botanical garden. He found out how traits are passed from one generation to another, i.e. inheritance. He studied this in peas [Pisum satwum) because they are easy to grow and can be shown each year.

  (iv) Which is correct about traits chosen by Mendel for his experiments on pea plant?

  A)
  Terminal pod was dominant done clear
  B)
  Constricted pod was dominant done clear
  C)
  Green coloured pod was dominant done clear
  D)
  Tall plants were recessive done clear
  View Solution play_arrow

• question_answer5)

  Direction Read the following and answer the questions from given below Mendel is known as the 'Father of Genetics' because of his ground breaking work on inheritance in pea plants 150 years ago. At the age of 21 Mendel while working in a monastery in Brunn (now in the Czech Republic) began a series of experiments in their botanical garden. He found out how traits are passed from one generation to another, i.e. inheritance. He studied this in peas [Pisum satwum) because they are easy to grow and can be shown each year.

  (v) Assertion [A] At \[{{F}_{2}}-generation\] in monohybrid cross, both parental traits are expressed in the proportion of 3:1.

  Reason [R] The contrasting parental traits show blending at \[{{F}_{2}}-generation\].

   
  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true, but R is not the correct explanation of A done clear
  C)
  A is true, but R is false done clear
  D)
  A is false, but R is true done clear
  View Solution play_arrow

• question_answer6)

  Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having 0 blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

  (i) Which of the following phenomenon is seen in blood group inheritance in humans?

   
  A)
  Pleiotropy          done clear
  B)
  Polygenic inheritance done clear
  C)
  Codominance     done clear
  D)
  Epistasis done clear
  View Solution play_arrow

• question_answer7)

  Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having O blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

  (ii) A person with blood group A can sho genotype

   
  A)
  \[{{I}^{A}}{{I}^{A}}\]                      done clear
  B)
  \[{{I}^{A}}{{I}^{B}}\] done clear
  C)
  \[{{I}^{B}}{{I}^{A}}\]                      done clear
  D)
  \[{{I}^{B}}{{I}^{B}}\] done clear
  View Solution play_arrow

• question_answer8)

  Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having O blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

  (iii) ABO blood group system is seen in human which is controlled by

   
  A)
  B-gene               done clear
  B)
  C-gene done clear
  C)
  I-gene             done clear
  D)
  n-gene done clear
  View Solution play_arrow

• question_answer9)

  Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having O blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

  (iv) Out of the three alleles of gene I, the sugar polymers on the plasma membrane of RBCs is controlled by how many alleles?

   
  A)
  All three             done clear
  B)
  Two done clear
  C)
  One                  done clear
  D)
  Zero done clear
  View Solution play_arrow

• question_answer10)

  Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having O blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

  (v) Four children belonging to the same parents have the following blood groups A, B, AB and O. Hence, the genotypes of the two parents are

   
  A)
  parents are homozygous for 'A' group done clear
  B)
  one parent is homozygous for 'A' and another parent is homozygous for 'B' done clear
  C)
  one parent is heterozygous for 'A' and another parent is heterozygous for 'B' done clear
  D)
  parents are homozygous for 'B' group done clear
  View Solution play_arrow

• question_answer11)

  Direction Read the following and answer the questions from given below

  Genes are segments of Deoxyribonucleic Acid (DNA) that contains the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are passed down the generations in a particular manner and we receive roughly half of our genetic material from each parent. Chromosomes describe and determine gender and any change in them causes chromosomal abnormalities.

  (i) The concept of chromosome movement during meiosis to explain Mendel's laws was used by

  A)
  Suttonand Boveri            done clear
  B)
  Malthus done clear
  C)
  Correns              done clear
  D)
  Morgan done clear
  View Solution play_arrow

• question_answer12)

  Direction Read the following and answer the questions from given below

  Genes are segments of Deoxyribonucleic Acid (DNA) that contains the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are passed down the generations in a particular manner and we receive roughly half of our genetic material from each parent. Chromosomes describe and determine gender and any change in them causes chromosomal abnormalities.

  (ii) Crossing over in diploid organism is responsible for

  A)
  segregation of alleles done clear
  B)
  recombination of linked alleles done clear
  C)
  dominance of genes done clear
  D)
  linkage between genes done clear
  View Solution play_arrow

• question_answer13)

  Direction Read the following and answer the questions from given below

  Genes are segments of Deoxyribonucleic Acid (DNA) that contains the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are passed down the generations in a particular manner and we receive roughly half of our genetic material from each parent. Chromosomes describe and determine gender and any change in them causes chromosomal abnormalities.

  (iii) If the genes are located in a chromosome as

  A-B-C-D-E-O-T.

  Which of the gene pairs will have least probability of being not inherited together?

  A)
  C and D            done clear
  B)
  A and T done clear
  C)
  A and B            done clear
  D)
  O and T done clear
  View Solution play_arrow

• question_answer14)

  Direction Read the following and answer the questions from given below

  Genes are segments of Deoxyribonucleic Acid (DNA) that contains the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are passed down the generations in a particular manner and we receive roughly half of our genetic material from each parent. Chromosomes describe and determine gender and any change in them causes chromosomal abnormalities.

  (iv) Both chromosome and gene (Mendelian factors) whether dominant or recessive are transmitted from one generation to next generation in

  A)
  changed form                 done clear
  B)
  unaltered form done clear
  C)
  altered form                   done clear
  D)
  disintegrated form done clear
  View Solution play_arrow

• question_answer15)

  Direction Read the following and answer the questions from given below

  Genes are segments of Deoxyribonucleic Acid (DNA) that contains the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are passed down the generations in a particular manner and we receive roughly half of our genetic material from each parent. Chromosomes describe and determine gender and any change in them causes chromosomal abnormalities.

  (v) Assertion [A] Behaviour of chromosomes is parallel to gene.

  Reason [R] Genes are located on the chromosomes.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true, but R is not the correct explanation of A done clear
  C)
  A is true, but R is false done clear
  D)
  A is false, but R is true done clear
  View Solution play_arrow

• question_answer16)

  Direction Read the following and answer the questions from given below

  Colour blindness is a sex-linked recessive disorder, which results in defect in either red or green cone of eye. It does not mean not seeing any colour at all, infact it leads to the failure in discrimination between red and green colour. The gene for colour blindness is present on X-chromosome. It is present mostly in males \[({{X}^{C}}Y)\] because of the presence of only one X-chromosome as compared to two chromosomes in females. A heterozygous female has normal vision, but is a carrier and passes on the disorder to some of her sons.

  (i) A woman has an X-linked condition on one of her X-chromosomes. This chromosome can be inherited by

  A)
  Only grand children done clear
  B)
  Only sons done clear
  C)
  Only daughters      done clear
  D)
  Sons and daughter done clear
  View Solution play_arrow

• question_answer17)

  Direction Read the following and answer the questions from given below

  Colour blindness is a sex-linked recessive disorder, which results in defect in either red or green cone of eye. It does not mean not seeing any colour at all, infact it leads to the failure in discrimination between red and green colour. The gene for colour blindness is present on X-chromosome. It is present mostly in males \[({{X}^{C}}Y)\] because of the presence of only one X-chromosome as compared to two chromosomes in females. A heterozygous female has normal vision, but is a carrier and passes on the disorder to some of her sons. A woman has an X-linked condition on one of her X-chromosomes. This chromosome can be inherited by

  (ii) Anish is having colour blindness and married to Sheela, who is not colourblind. What is the chance that their son will have the disease?

  A)
  100%                            done clear
  B)
  50% done clear
  C)
  25%                  done clear
  D)
  0% done clear
  View Solution play_arrow

• question_answer18)

  Direction Read the following and answer the questions from given below

  Colour blindness is a sex-linked recessive disorder, which results in defect in either red or green cone of eye. It does not mean not seeing any colour at all, infact it leads to the failure in discrimination between red and green colour. The gene for colour blindness is present on X-chromosome. It is present mostly in males \[({{X}^{C}}Y)\] because of the presence of only one X-chromosome as compared to two chromosomes in females. A heterozygous female has normal vision, but is a carrier and passes on the disorder to some of her sons. A woman has an X-linked condition on one of her X-chromosomes. This chromosome can be inherited by

  (iii) If both parents of a male child are normal, what are the chances of the child being colourblind?

  A)
  It is impossible done clear
  B)
  lt is possible only if father's mother was colourblind done clear
  C)
  It is possible only if mother's father was colourblind done clear
  D)
  It is possible even when all the four grandparents had normal vision done clear
  View Solution play_arrow

• question_answer19)

  Direction Read the following and answer the questions from given below

  Colour blindness is a sex-linked recessive disorder, which results in defect in either red or green cone of eye. It does not mean not seeing any colour at all, infact it leads to the failure in discrimination between red and green colour. The gene for colour blindness is present on X-chromosome. It is present mostly in males \[({{X}^{C}}Y)\] because of the presence of only one X-chromosome as compared to two chromosomes in females. A heterozygous female has normal vision, but is a carrier and passes on the disorder to some of her sons. A woman has an X-linked condition on one of her X-chromosomes. This chromosome can be inherited by

  (iv) If a colourblind man marries a woman who is carrier of colourblind, the probability of their son being colourblind is

  A)
  50%                done clear
  B)
  0.5 done clear
  C)
  0.75                  done clear
  D)
  1 done clear
  View Solution play_arrow

• question_answer20)

  Direction Read the following and answer the questions from given below

  Colour blindness is a sex-linked recessive disorder, which results in defect in either red or green cone of eye. It does not mean not seeing any colour at all, infact it leads to the failure in discrimination between red and green colour. The gene for colour blindness is present on X-chromosome. It is present mostly in males \[({{X}^{C}}Y)\] because of the presence of only one X-chromosome as compared to two chromosomes in females. A heterozygous female has normal vision, but is a carrier and passes on the disorder to some of her sons. A woman has an X-linked condition on one of her X-chromosomes. This chromosome can be inherited by

  (v) Assertion [A] When a colourblind woman marries a normal man all her sons show colour blindness and all her daughters have normal vision.

  Reason [R] When these daughters marry a colourblind man, 75% of their sons as well as daughters are colourblind.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true, but R is not the correct explanation of A done clear
  C)
  A is true, but R is false done clear
  D)
  A is false, but R is true done clear
  View Solution play_arrow

• question_answer21)

  Direction Read the following and answer the questions from given below

  Many human diseases have genetic component. Some of these conditions are under investigation by researchers or associated with National Human Genome Research Institute (NHGRI). A genetic disorder is a disease caused in whole or in part by change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutations in one gene (monogenic disorder), by mutation in multiple genes (multifactorial inheritance disorder) or by a combination of gene mutations and environmental factors or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structure that carry genes).

  (i) A hereditary disease which is never passed on from father to son is

  A)
  autosomal linked disease done clear
  B)
  X-chromosomal linked disease done clear
  C)
  Y-chromosomal linked disease done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer22)

  Direction Read the following and answer the questions from given below

  Many human diseases have genetic component. Some of these conditions are under investigation by researchers or associated with National Human Genome Research Institute (NHGRI). A genetic disorder is a disease caused in whole or in part by change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutations in one gene (monogenic disorder), by mutation in multiple genes (multifactorial inheritance disorder) or by a combination of gene mutations and environmental factors or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structure that carry genes).

  (ii) Mendelian disorder may be of

  A)
  recessive done clear
  B)
  dominant done clear
  C)
  Both [a] and [b] done clear
  D)
  cannot be determined done clear
  View Solution play_arrow

• question_answer23)

  Direction Read the following and answer the questions from given below

  Many human diseases have genetic component. Some of these conditions are under investigation by researchers or associated with National Human Genome Research Institute (NHGRI). A genetic disorder is a disease caused in whole or in part by change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutations in one gene (monogenic disorder), by mutation in multiple genes (multifactorial inheritance disorder) or by a combination of gene mutations and environmental factors or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structure that carry genes).

  (iii) Non-disjunction in meiosis results in

  A)
  trisomy            done clear
  B)
  normal diploid done clear
  C)
  gene mutation                done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer24)

  Direction Read the following and answer the questions from given below

  Many human diseases have genetic component. Some of these conditions are under investigation by researchers or associated with National Human Genome Research Institute (NHGRI). A genetic disorder is a disease caused in whole or in part by change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutations in one gene (monogenic disorder), by mutation in multiple genes (multifactorial inheritance disorder) or by a combination of gene mutations and environmental factors or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structure that carry genes).

  (iv) Failure of segregation of chromatid during cell division cycle, results in the gain or loss of chromosome which is called

  A)
  aneuploidy done clear
  B)
  hypopolyploidy done clear
  C)
  hyperpolyploidy done clear
  D)
  polyploidy done clear
  View Solution play_arrow

• question_answer25)

  Direction Read the following and answer the questions from given below

  Many human diseases have genetic component. Some of these conditions are under investigation by researchers or associated with National Human Genome Research Institute (NHGRI). A genetic disorder is a disease caused in whole or in part by change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutations in one gene (monogenic disorder), by mutation in multiple genes (multifactorial inheritance disorder) or by a combination of gene mutations and environmental factors or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structure that carry genes).

  (v) Monosomy and trisomy are represented respectively as

   
  A)
  n-1, n+2          done clear
  B)
  2n+2, 2n+1 done clear
  C)
  2n-1, 2n+1        done clear
  D)
  2n-2, 2n+1 done clear
  View Solution play_arrow

• question_answer26)

  Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows.

  (i) Homologous chromosomes synapse during meiosis and get separated to pass into different cells. This is the basis for which law of inheritance?

  A)
  Law of dominance done clear
  B)
  Law of segregation done clear
  C)
  Law of independent assortment done clear
  D)
  Both [b] and [c] done clear
  View Solution play_arrow

• question_answer27)

  Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows.

  (ii) Sometimes chromosome number increases or decreases due to

  A)
  mutagenic change done clear
  B)
  non-disjunction of chromosome done clear
  C)
  genetic repeats done clear
  D)
  AII of the above done clear
  View Solution play_arrow

• question_answer28)

  Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows.

  (iii) Failure of the two homologous chromosomes to separate and move towards opposite poles during anaphase-I is called

  A)
  crossing over                  done clear
  B)
  non-disjunction done clear
  C)
  linkage               done clear
  D)
  recombination done clear
  View Solution play_arrow

• question_answer29)

  Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows.

  (iv) Chromosome theory states that

  A)
  genes are located on chromosome done clear
  B)
  chromosome is made up of DNA done clear
  C)
  chromosome is made up of RNA done clear
  D)
  AII of the above done clear
  View Solution play_arrow

• question_answer30)

  Observe the given diagram of meiosis and germ cell formation in a cell with four chromosomes and answer the questions that follows.

  (v) If a gamete has 16 chromosomes, what will be the number of chromatids before anaphase-I?

   
  A)
  8                 done clear
  B)
  16 done clear
  C)
  32                                 done clear
  D)
  64 done clear
  View Solution play_arrow