Principles Of Inheritance And Variation — DPP 15

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.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Which Mendelism idea is depicted by a cross in which the $\mathrm { F } _ { 1 }$-generation resembles both the parents?
  1. A co-dominance
  2. B incomplete dominance
  3. C law of dominance
  4. D inheritance of one gene
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Correct answer: A

2
In a cross between individuals homozygous for (a, b) and AaBb, 700 out of 1000 individuals were of parental type. Then the distance between a and b is :-
  1. A 70 map unit
  2. B 35 map unit
  3. C 30 map unit
  4. D 15 map unit
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Correct answer: C

3
The genotype of a plant showing the dominant phenotype can be determined by
  1. A Pedigree analysis
  2. B Back cross
  3. C Test cross
  4. D Dihybrid cross
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Correct answer: C

4
Which of the following is not concerned with sickle cell anaemia :-
  1. A Sixth position of $\beta$-chain
  2. B $\alpha$-chain of Hb
  3. C Valine
  4. D Haemoglobin
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Correct answer: B

5
In Morgan's experiment, what will be percentage of recombination in case of body colour and eye colour in Drosophila?
  1. A $37.2 \%$
  2. B $1.3 \%$
  3. C $98.7 \%$
  4. D $37.2 \%$
Show answer

Correct answer: B

6
Study the pedigree chart given below :-
Principles Of Inheritance And Variation – NEET-5065 What does it show :-
  1. A Inheritance of a recessive sex-linked disease like haemophilia.
  2. B Inheritance of a sex-linked inborn error of metabolism like phenylketonuria.
  3. C Inheritance of a condition like phenylketonuria as an autosomal recessive trait.
  4. D The pedigree chart is wrong as this is not possible.
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Correct answer: C

7
A woman with normal vision marries a man with normal vision and gives birth to a colourblind son. Her husband dies and she marries a colourblind man. what is the probability of her children having the abnormality :-
  1. A $50 \%$ colourblind sons $+$ $50 \%$ colourblind daughters
  2. B All sons colourblind & daughters carrier
  3. C All daughters colourblind & sons normal
  4. D $50 \%$ sons colourblind and all daughters normal
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Correct answer: A

8
The ultimate biological unit which controls heredity, is called :
  1. A Genome
  2. B Chromosome
  3. C Genotype
  4. D Gene
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Correct answer: D

9
Analysis of traits in a several generation of a family is called :-
  1. A Mendelian disorder
  2. B Chromosomal disorder
  3. C Pedigree
  4. D Aneuploidy
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Correct answer: C

10
Based on observation on monohybrid crosses Mendel draw some conclusion. Which of the following is not correct :-
  1. A Characters are controlled by discrete units called factors
  2. B Factors occur in pairs
  3. C In a similar pair of factors one member of the pair dominates the other
  4. D The postulate of dominance also explains the proportion of $3 : 1$ obtained at the $\mathrm{F _ { 2 }}$
Show answer

Correct answer: C

11
Given below are two statements:
Statement-I : Heterozygous female for haemophilia may transmit the disease to sons.
Statement-II : Sickle-cell anaemia is caused by the substitution of valine (val) by glutamic acid (Glu) of $\beta$-globin chain.
In the light of the above statements, choose the correct answer from the options given below:
  1. A Both Statement-I and Statement-II are incorrect.
  2. B Statement-I is correct but statement-II is incorrect.
  3. C Statement-I is incorrect but Statement-II is correct.
  4. D Both Statement-I and Statement-II are correct.
Show answer

Correct answer: B

12
A normal woman, whose father was colourblind is married to a normal man. The sons would be :-
  1. A All colour-blind
  2. B $75 \%$ colour-blind
  3. C $50 \%$ colour-blind
  4. D All normal
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Correct answer: C

13
Drosophila melanogaster is best material for study of inheritance. Which of the following reason is not appropriate for selection of Drosophila ?
  1. A They can grow on simple synthetic medium
  2. B They complete their life cycle in about two weeks
  3. C Single mating could produce small number of progeny
  4. D Clear differentiation of the sexes
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Correct answer: C

14
If Mendel might have studies 7 pairs of characters in a plant with 12 chromosomes, instead of 14, then :-
  1. A He could not discover independent assortment
  2. B He might have not discovered linkage
  3. C He might have discovered crossing-over
  4. D He might have not observed dominance
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Correct answer: A

15
If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
  1. A $100 \%$
  2. B No chance
  3. C $50 \%$
  4. D $25 \%$
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Correct answer: D

16
Multiple alleles can be found only when :-
  1. A Population studies are made
  2. B Individual study is made
  3. C Mutation is absent
  4. D Dominance is present
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Correct answer: A

17
Which of the following points is of Mendelism?
  1. A law of independent assortment which was based on monohybrid cross
  2. B law of independent assortment which could be stated on the basis of segregation of gametes
  3. C incomplete dominance gave a new way to mendelism
  4. D a character is controlled by a pair of unit factors
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Correct answer: D

18
In sickle cell anaemia which of the following genotype will show diseased phenotype :-
  1. A $\mathrm { Hb } ^ { \mathrm { A } } \mathrm { Hb } ^ { \mathrm { A } }$
  2. B $\mathrm { Hb } ^ { \mathrm { S } } \mathrm { Hb } ^ { \mathrm { S } }$
  3. C $\mathrm { Hb } ^ { \mathrm { S } } \mathrm { Hb } ^ { \mathrm { A } }$
  4. D Both (A) and (B)
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Correct answer: B

19
Which part is removed at the time of emasculation in unisexual flower :-
  1. A Anther
  2. B Carpel
  3. C Stamen
  4. D None
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Correct answer: D

20
A test cross is carried out to :-
  1. A assess the number of alleles of a gene.
  2. B determine whether two species or varieties will breed successfully.
  3. C determine the genotype of a plant at $\mathrm{F _ { 2 }}$
  4. D predict whether two traits are linked.
Show answer

Correct answer: C

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