12th Class Biology Principle Of Inheritance And Variation Question Bank

done SAT - Principles of Inheritance and Variation Total Questions - 35

• question_answer1)
  Which one of the following is an example of polygenic inheritance?
  A)
  Skin colour in humans done clear
  B)
  Flower colour in Mirabilis jalapa done clear
  C)
  Production of male Honey Bee done clear
  D)
  Pod shape in Garden Pea. done clear
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• question_answer2)
  Phenotype of an organism is the result of
  A)
  Genotype and environment interactions done clear
  B)
  Mutations and linkages done clear
  C)
  Cytoplasmic effect and nutrition done clear
  D)
  Environmental changes and sexual dimorphism. done clear
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• question_answer3)
  How many different kinds of gametes will be produced by a plant having the genotype AA Bb CC
  A)
  Two done clear
  B)
  Three done clear
  C)
  Four done clear
  D)
  Nine. done clear
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• question_answer4)
  In Mendel's experiments with Garden Pea, round seed shape (RR) was dominant over wrinkled seed (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the \[{{F}_{2}}\]generation of the cross \[RRYY~\,\,\times \,\,rryy\]
  A)
  Round seeds with green cotyledons and wrinkled seeds with yellow cotyledons done clear
  B)
  Only round seeds with green cotyledons done clear
  C)
  Only wrinkled seeds with yellow cotyledons done clear
  D)
  Only wrinkled seeds with green cotyledons. done clear
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• question_answer5)
  Test cross involves
  A)
  Crossing between two genotypes with dominant trait done clear
  B)
  Crossing between two genotypes with recessive trait done clear
  C)
  Crossing between two \[{{F}_{1}}\] hybrids done clear
  D)
  Crossing the \[{{F}_{1}}\] hybrid with a double recessive genotype. done clear
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• question_answer6)
  In which mode of inheritance do you expect more maternal influence among the offspring
  A)
  X - linked done clear
  B)
  Autosomal done clear
  C)
  Cytoplasmic done clear
  D)
  Y - linked. done clear
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• question_answer7)
  Which one of the following is most suitable medium for culture of Drosophila melanogaster?
  A)
  Cow dung done clear
  B)
  Moist bread done clear
  C)
  Agar agar done clear
  D)
  Ripe Banana. done clear
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• question_answer8)
  If colour blind woman marries a normal visioned man, their sons will be
  A)
  All colour blinds done clear
  B)
  All normal visioned done clear
  C)
  One half colour blind and one half normal done clear
  D)
  Three fourth colour blind and one fourth normal. done clear
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• question_answer9)
  Which one of the following pairs of features is a good example of polygenic inheritance?
  A)
  Human height and skin colour done clear
  B)
  ABO blood group in humans and flower colour in Mirabilis jalapa done clear
  C)
  Hair pigment of Mouse and tongue rolling in humans done clear
  D)
  Human eye colour and sickle cell anaemia done clear
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• question_answer10)
  Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called
  A)
  Reciprocal cross done clear
  B)
  Test cross done clear
  C)
  Dihybrid cross done clear
  D)
  Back cross. done clear
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• question_answer11)

  A simplified representation of human sex chromosomes, shows gene a and b which could be of

  A)
  Colour blindness and body height done clear
  B)
  Attached ear lob and Rh blood group done clear
  C)
  Haemophilia and red green colour blindness done clear
  D)
  Phenylketonuria and haemophilia. done clear
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• question_answer12)
  Genes present in the cytoplasm of eukaryotic cells are found in
  A)
  Mitochondria and inherited via egg cytoplasm done clear
  B)
  Lysosomes and peroxisomes done clear
  C)
  Golgi bodies and smooth endoplasmic reticulum done clear
  D)
  Plastids and inherited via male gamete. done clear
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• question_answer13)
  In which one of the following combinations (A-D) of the number of chromosomes in present day hexaploidy wheat correctly represented
  A)

  Combination	Monosomic	Haploid	Nullisomic	Trisomic
  	21	28	42	43

  done clear
  B)

  Combination	Monosomic	Haploid	Nullisomic	Trisomic
  	7	28	40	42

  done clear
  C)

  Combination	Monosomic	Haploid	Nullisomic	Trisomic
  	21	7	42	43

  done clear
  D)

  Combination	Monosomic	Haploid	Nullisomic	Trisomic
  	41	21	40	43

  done clear
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• question_answer14)
  A common test to find the genotype of a hybrid is by
  A)
  Crossing of one \[{{F}_{2}}\] progeny with dominant parent done clear
  B)
  Studying the sexual behaviour of \[{{F}_{1}}\] progenies done clear
  C)
  Crossing of one \[{{F}_{1}}\] progeny with recessive parent done clear
  D)
  Crossing of one \[{{F}_{2}}\] progeny with recessive parent. done clear
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• question_answer15)
  Inheritance of skin colour in human is an example of
  A)
  Codominance done clear
  B)
  Point mutation done clear
  C)
  Chromosomal aberration done clear
  D)
  Polygenic inheritance. done clear
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• question_answer16)
  In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in \[{{F}_{1}}\] generation?
  A)
  9 : 1 done clear
  B)
  1 : 3 done clear
  C)
  3 : 1 done clear
  D)
  50 : 50. done clear
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• question_answer17)
  A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
  A)
  Aa BB done clear
  B)
  AA Bb done clear
  C)
  AA BB done clear
  D)
  Aa Bb. done clear
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• question_answer18)
  Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridised, the \[{{F}_{2}}\] segregation will show
  A)
  Segregation in the expected 9 : 3 : 3 : 1 ratio done clear
  B)
  Segregation in 3 : 1 ratio done clear
  C)
  Higher number of parental types done clear
  D)
  Higher number of recombinant types. done clear
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• question_answer19)
  In a given plant, red colour (R) of fruits is dominant over white fruit (r); and tallness (T) is dominant over dwarfness (t). If a plant with genotype RRTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?
  A)
  100% done clear
  B)
  75% done clear
  C)
  50% done clear
  D)
  25%. done clear
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• question_answer20)
  Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) \[\times \] aa bb cc (light colour), in \[{{F}_{2}}\] generation what proportion of progeny is likely to resemble either parent?
  A)
  One third done clear
  B)
  50 percent done clear
  C)
  Less than 5 percent done clear
  D)
  100 percent. done clear
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• question_answer21)
  Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
  A)
  25% done clear
  B)
  50% done clear
  C)
  75% done clear
  D)
  100%. done clear
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• question_answer22)
  Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that
  A)
  Y-chromosome is essential for sex determination of Drosophila done clear
  B)
  Y-chromosome is female determining in Drosophila done clear
  C)
  Y-chromosome is male determining in human beings done clear
  D)
  Y-chromosome has no role in sex determination either in Drosophila or human beings. done clear
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• question_answer23)

  Study the pedigree chart given below: What does it show?

  A)
  Inheritance of a recessive sex-linked disease like haemophilia done clear
  B)
  Inheritance of a condition like phenylketonuria as an autosomal recessive trait done clear
  C)
  Inheritance of a sex-linked inborn error of metabolism like phenylketonuria done clear
  D)
  The pedigree chart is wrong as this is not possible. done clear
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• question_answer24)
  The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC because O in it refers to having :
  A)
  No antigen A and B on RBCs done clear
  B)
  Other antigens besides A and B on RBCs done clear
  C)
  Overdominance of this type on the genes for A and B types done clear
  D)
  One antibody only-either anti-A or anti- B on the RBCs. done clear
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• question_answer25)
  Select the incorrect statement from the following:
  A)
  Baldness is a sex-limited trait done clear
  B)
  Linkage is an exception to the principle of independent assortment in heredity done clear
  C)
  Galactosemia is an inborn error of metabolism done clear
  D)
  Small population size results in random genetic drift in a population done clear
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• question_answer26)

  Directions: (26 - 30)

  In the following questions a statement of assertion followed by a statement of reason is given.

  Choose the correct answer out of the following choices:

  Assertion: Pea flowers are bisexual and easily cultivated for experiment.

  Reason: Many pure breeding varieties of Pea are recorded by G. J. Mendel.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer27)

  Assertion: Phenotype is the external appearance of an individual.

  Reason: Genotype is the gene complement of an individual.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer28)

  Assertion: Test cross is also an example of back cross.

  Reason: Monohybrid test cross ratio is 1 : 2 : 1.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer29)

  Assertion: Crossing over always takes place between non sister chromatid of non - homologous chromosome.

  Reason: Crossing over occur during the pachytene of meiosis - I.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer30)

  Assertion: Drone is haploid and it is male fertile caste of honey bee.

  Reason: Worker is diploid and it is female sterile caste of honey bee.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
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• question_answer31)

  Directions: (31 - 35)

  Read the passage given below and answer the following questions.

  INCOMPLETE DOMINANCE (Carl Correns, 1903; Intermediate Inheritance; 1 : 2 : 1). When experiments on Peas were repeated using other traits in other plants, it was found that sometimes the \[{{F}_{1}}\] had a phenotype that did not resemble either of the two parents and was in between the two i.e., blending. The inheritance of flower colour in the dog flower or Snapdragon or Antirrhinummajus is a good example to understand incomplete dominance. In a cross between true-breeding red-flowered (RR) and true breeding white-flowered plants (rr), the \[{{F}_{1}}\] (Rr) was pink. When the \[{{F}_{1}}\] was self-pollinated the \[{{F}_{2}}\] resulted in the following ratio 1 (RR) Red : 2 (Rr) Pink : 1 (rr) White. Here, the genotype ratios were exactly as we would expect in any mendelian monohybrid cross, but the phenotype ratios had changed from the 3 : 1 dominant : recessive ratio.

  Incomplete dominance term is coined by which of the following?
  A)
  G. J. Mendel, 1859 done clear
  B)
  Carl Correns, 1903 done clear
  C)
  Bateson, 1905 done clear
  D)
  Johhannsen, 1911 done clear
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• question_answer32)
  \[{{F}_{1}}\] generation of Dog flower is of which colour
  A)
  Red done clear
  B)
  White done clear
  C)
  Roan done clear
  D)
  Pink done clear
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• question_answer33)
  Genotype of pink flower of Antirrhinum majus in \[{{F}_{1}}\] generation is
  A)
  RR done clear
  B)
  rr done clear
  C)
  Rr done clear
  D)
  Rrr done clear
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• question_answer34)
  Phenotypic ratio of Dog flower cross between red and white flower in \[{{F}_{2}}\] generation is
  A)
  3 : 1 done clear
  B)
  1 : 1 done clear
  C)
  1 : 2 : 1 done clear
  D)
  2 : 1 done clear
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• question_answer35)
  Rr genotype of \[{{F}_{1}}\] generation is responsible for the pink colouration in Dog flower. It indicates
  A)
  R is dominant over r. done clear
  B)
  r is dominant over R. done clear
  C)
  r is recessive to R. done clear
  D)
  Partial interaction between R and r. done clear
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