Principles Of Inheritance And Variation — DPP 5

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 the inheritance of flower colour in dog flower plant, the $\mathrm{F _ { 1 }}$ had a phenotype that :-
  1. A resembles both of the parents
  2. B did not resembles either of the two parents
  3. C resembles with only one parent
  4. D Both (A) and (C)
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Correct answer: B

2
A child with mother of blood group A and father of blood group AB, will not have which of the following blood group :-
  1. A A
  2. B B
  3. C AB
  4. D O
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Correct answer: D

3
AB - Blood group shows :-
  1. A Co-dominance
  2. B Complete dominance
  3. C Mixed inheritance
  4. D Composite inheritance
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Correct answer: A

4
When both alleles of a pair are fully expressed in a heterozygote, they are called
  1. A Lethal
  2. B Co-dominants
  3. C Semi-dominants
  4. D Recessive allele
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Correct answer: B

5
Mendel did not propose :-
  1. A Dominance
  2. B Incomplete dominance
  3. C Segregation
  4. D Independent assortment
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Correct answer: B

6
Dihybrid test cross ratio proposed by Mendel is :-
  1. A $9 : 3 : 3 : 1$
  2. B $1 : 1 : 1 : 1$
  3. C $1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1$
  4. D $3 : 1$
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Correct answer: C

7
Incomplete dominance is found in :-
  1. A Pisum sativum
  2. B Antirrhinum majus
  3. C Both Pisum sativum and Antirrhinum majus
  4. D None of these
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Correct answer: C

8
The recessive characters are :-
  1. A Only expressed in heterozygous condition
  2. B Only expressed in homozygous condition
  3. C Blend in heterozygous condition
  4. D Always impure
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Correct answer: B

9
Inheritance of skin colour in human beings is an example of :-
  1. A Complementary gene
  2. B Monogenic inheritance
  3. C Polygenic inheritance
  4. D Mendelian inheritance
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Correct answer: C

10
In a dihybrid cross, when one pair of alleles show incomplete dominance, genotypic ratio comes to :-
  1. A $3 : 6 : 3 : 1 : 2 : 1$
  2. B $1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1$
  3. C $9 : 3 : 3 : 1$
  4. D $1 : 2 : 1$
Show answer

Correct answer: B

11
Which of the following condition is true for codominance :-
  1. A Phenotype of $\mathrm{F _ { 1 }}$ resembled either of the two parents
  2. B Phenotype of $\mathrm{F _ { 1 }}$ did not resemble either of two parents
  3. C Phenotype of $\mathrm{F _ { 1 }}$ resembles both parents
  4. D None of these
Show answer

Correct answer: C

12
When certain character is inherited only through the female parent, it probably represents the case of :-
  1. A Mendelian nuclear inheritance
  2. B Multiple gene inheritance
  3. C Cytoplasmic inheritance
  4. D Incomplete dominance
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Correct answer: C

13
When a red flowered plant was cross pollinated by white flowered one and the offspring were self pollinated to obtain a phenotypic ratio of $1 : 2 : 1$, it has to be a case of:
  1. A Incomplete dominance
  2. B Dominance
  3. C Recessive epistasis
  4. D Pleiotropic effect of genes
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Correct answer: A

14
In sickle cell anaemia :-
  1. A The mutant haemoglobin molecule undergoes polymerisation under low oxygen tension causing the change in the shape of RBC
  2. B Substitution of Glutamic acid by valine at the sixth position of the $\alpha$-chain of haemoglobin
  3. C The mutant haemoglobin undergoes polymerization under high oxygen tension causing the change in shape of RBC
  4. D $\alpha$-globin chain is modified
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Correct answer: A

15
A dihybrid ratio of $1 : 4 : 6 : 4 : 1$ is obtained instead of $9 : 3 : 3 : 1$. This is an example of :-
  1. A Complementary gene
  2. B Supplementary gene
  3. C Polygenic inheritance
  4. D Incomplete dominance
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Correct answer: C

16
Mendel observed that all the $\mathrm{F _ { 1 }}$ progeny plants :-
  1. A resembled either one of the parents
  2. B resembled neither of the parents
  3. C resembled both of the parents
  4. D shows $3 : 1$ ratio
Show answer

Correct answer: A

17
During breeding the removal of anthers from a flower is called :-
  1. A Anthesis
  2. B Pollination
  3. C Emasculation
  4. D Vasectomy
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Correct answer: C

18
In Mirabilis red (RR) and white (rr) flowered plant produces pink (Rr) flower. A plant with pink flowered plant is crossed with a plant with white flower the expected phenotypic ratio is :-
  1. A red : pink : white $(1 : 2: 1)$
  2. B pink : white $(1 : 1)$
  3. C red : pink $( 1 : 1 ) $
  4. D red : white $(3 : 1)$
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Correct answer: B

19
Polygenic genes show :-
  1. A Identical phenotypes
  2. B Identical biochemistry
  3. C Different phenotypes
  4. D Identical genotypes
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Correct answer: C

20
A gene is said to be dominant if :-
  1. A It express it's effect only in homozygous stage.
  2. B It is expressed only in heterozygous condition.
  3. C It is expressed both in homozygous and heterozygous condition.
  4. D It is never expressed in any condition.
Show answer

Correct answer: C

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