Principles Of Inheritance And Variation — DPP 10

20 NEET questions from Principles Of Inheritance And Variation, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
In any dihybrid cross segregation of one pair of characters is independent of other pair of characters, is known as :-
  1. A Law of segregation
  2. B Law of purity of gametes
  3. C Law of independent assortment
  4. D Law of dominance
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Correct answer: C

2
Haemophilia is more commonly seen in human males than in human females because:-
  1. A This disease is due to a Y-linked recessive mutation
  2. B This disease is due to an X-linked recessive mutation
  3. C This disease is due to an X-linked dominant gene
  4. D A greater proportion of girls die in infancy
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Correct answer: B

3
Incomplete dominance can be seen in :-
  1. A Flower colour in Mirabilis jalapa
  2. B Flower colour in Pisum sativum
  3. C Size of starch grains in pea
  4. D Both (A) and (C)
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Correct answer: D

4
Sickle cell anaemia induces due to :-
  1. A Change of Amino Acid in $\alpha -$ chain of Haemoglobin
  2. B Change of Amino Acid in $\beta$-chain of Haemoglobin
  3. C Change of Amino Acid in both $\alpha$ and $\beta$-chain of Haemoglobin
  4. D Change of Amino acid either $\alpha$ or $\beta$-chain of Haemoglobin
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Correct answer: B

5
Sex-linked disorders are generally :-
  1. A Lethal
  2. B Recessive
  3. C Dominant
  4. D Not inherited
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Correct answer: B

6
Probability of four sons to a couple is :-
  1. A $\frac { 1 } { 4 }$
  2. B $\frac { 1 } { 8 }$
  3. C $\frac { 1 } { 16 }$
  4. D $\frac { 1 } { 32 }$
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Correct answer: C

7
If a cross is made between two individuals each having genotype Bb, two offsprings are obtained. Out of these first has dominant trait. What is the probability that the second offspring will exhibit recessive trait ?
  1. A $1 / 4$
  2. B 100
  3. C Zero
  4. D $3/4$
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Correct answer: A

8
Variations are :-
  1. A Degree by which progeny differs from their parents
  2. B Degree by which progeny is similar to their parents
  3. C Process by which characters are passed on from parent to progeny
  4. D True breeding lines
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Correct answer: A

9
Segregation of alleles is a random process so what would be the chances of a gamete containing either alleles?
  1. A $25 \%$
  2. B $50 \%$
  3. C $75 \%$
  4. D $100 \%$
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Correct answer: B

10
With increasing age the linkage becomes :-
  1. A Strong
  2. B Weak
  3. C Terminates
  4. D Remains unchanged
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Correct answer: A

11
The longer the chromosome of an organism, the more genetic variability it gets from :-
  1. A Independent assortment
  2. B Linkage
  3. C Crossing over
  4. D Mutation
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Correct answer: C

12
Which is incorrect for Drosophila melanogaster ?
  1. A They could be grown on simple synthetic medium
  2. B Single mating could produce a large number of progeny
  3. C They complete their life cycle in about 7 weeks
  4. D There was a clear differentiation of the sexes.
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Correct answer: C

13
Predict from the following chart :-
Principles Of Inheritance And Variation – NEET-4789
  1. A Character is dominant and carried by X chromosome
  2. B Character is carried by Y chromosome
  3. C Character is sex linked recessive
  4. D Character is autosomal recessive
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Correct answer: C

14
Who postulated the 'Chromosomal theory of Inheritance' ?
  1. A De Vries
  2. B Mendel
  3. C Sutton and Boveri
  4. D Morgan
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Correct answer: C

15
A tobacco plant heterozygous for albinism is self-pollinated and 1200 seeds are subsequently germinated. How many seedlings would have the parental genotype:-
  1. A 900
  2. B 600
  3. C 1200
  4. D 300
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Correct answer: B

16
A pedigree is shown below for a disease that is autosomal recessive. The genetic makeup of the first generation :-
Principles Of Inheritance And Variation – NEET-4793
  1. A $\mathrm { AA } , \mathrm { aa }$
  2. B $\mathrm { Aa } , \mathrm { Aa }$
  3. C $\mathrm { Aa } , \mathrm { aa }$
  4. D $\mathrm { aa } , \mathrm { aa }$
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Correct answer: B

17
In case of codominance :-
  1. A $\mathrm{F _ { 1 }}$ generation resembles both parents
  2. B $\mathrm{F _ { 1 }}$ generation is in between both parents
  3. C $\mathrm{F _ { 1 }}$ generation resembles either of the two parents
  4. D All of the above
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Correct answer: A

18
It was found that sometimes the $\mathrm{F _ { 1 }}$ had a phenotype that did not resemble either of the two parents and was in between the two. This is the case of :-
  1. A Dominance
  2. B Incomplete dominance
  3. C Codominance
  4. D Pleiotropism
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Correct answer: B

19
How the sex of offsprings determined in humans :-
  1. A Sex chromosome of mother
  2. B Size of ovum
  3. C Size of sperm
  4. D Sex chromosome of father
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Correct answer: D

20
If a colour blind man marries a girl who is normal (homozygous) for this character, then genotypically :-
  1. A sons and daughters will be normal
  2. B sons will be colour blind, daughters will be normal
  3. C sons will be normal, daughters will be carriers
  4. D both sons and daughters will be colour blind
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Correct answer: C

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