Principles Of Inheritance And Variation — DPP 6

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
What would be the nature of children if a colour blind woman marries a normal man:
  1. A Colourblind daughter & normal sons
  2. B Colourblind sons and carrier daughters
  3. C Normal sons & carrier daughters
  4. D Normal sons & Normal daughters
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Correct answer: B

2
In tomato, genotype aabbcc produces 100 g tomatoes and AABBCC produces 160 g tomatoes. What is contribution of each dominant allele in the production of tomatoes:-
  1. A 10 g
  2. B 20 g
  3. C 30 g
  4. D 40 g
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Correct answer: A

3
In polygenic inheritance a trait is controlled by three polygenes. Two individuals which are heterozygous for three alleles, crossed with each other. Such type of cross produces what phenotypic ratio :-
  1. A $1 : 2 : 1$
  2. B $9 : 3 : 3 : 1$
  3. C $1 : 4 : 6 : 4 : 1$
  4. D $1 : 6 : 15 : 20 : 15 : 6 : 1$
Show answer

Correct answer: D

4
The three different alleles of human $A B O$ blood types will produce how many genotypes \& phenotypes, respectively :-
  1. A 4 & 6
  2. B 6 & 4
  3. C 6 & 6
  4. D 4 & 4
Show answer

Correct answer: B

5
A trihybrid cross is made between two plants with genotypes $\mathrm { A } / \mathrm { a } \mathrm { B } / \mathrm { b } \mathrm { C } / \mathrm { c }$ how many offsprings of such cross will have a genotype $\mathrm { a } / \mathrm { a } \mathrm { b } / \mathrm { b } \mathrm { c } / \mathrm { c }$ ?
  1. A $1 / 64$
  2. B $1 / 4$
  3. C $1 / 16$
  4. D $1 / 32$
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Correct answer: A

6
Which cross yields red, white \& pink flowers variety of dog flower :-
  1. A $\mathrm { RR } \times \mathrm { Rr }$
  2. B $\mathrm { Rr } \times \mathrm { RR }$
  3. C $\mathrm { Rr } \times \mathrm { Xr }$
  4. D $\mathrm { Rr } \times \mathrm { Xr }$
Show answer

Correct answer: C

7
Which of the following is the example of codominance :-
  1. A $\mathrm{H b^{A}}$ $\mathrm{H b^{A}}$, $\mathrm{I^{A}}$ $\mathrm{I^{B}}$
  2. B $\mathrm{H b^{5}}$ $\mathrm{H b^{5}}$, $\mathrm{I^{A}}$ $\mathrm{I^{B}}$
  3. C $\mathrm{H b^{A}}$ $\mathrm{H b^{5}}$, $\mathrm{A^{A}}$ $\mathrm{I^{B}}$
  4. D $\mathrm{H b ^ {s}}$ $\mathrm{H b ^ {s}}$, $\mathrm{I ^ {A}}$ $\mathrm{I ^ {A}}$
Show answer

Correct answer: C

8
Incomplete dominance occurs in :-
  1. A Mirabilis
  2. B Antirrhinum
  3. C Andalusian fowl
  4. D All of the above
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Correct answer: D

9
Which of the following is not a sex linked characters?
  1. A Haemophilia
  2. B Colour blindness
  3. C Hypertrichosis
  4. D Baldness
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Correct answer: D

10
A colourblind man marries a normal lady whose father was colour blind. If they produce two sons & two daughters, how many of them would suffer?
  1. A Both sons
  2. B Both daughters
  3. C One son & one daughter
  4. D Both sons & both daughters
Show answer

Correct answer: C

11
What ratio is expected in offsprings if father is colour blind and mother's father was colour blind :-
  1. A 50\% daughters - colour blind
  2. B All the sons - colour blind
  3. C All the daughters - colour blind
  4. D All the sons - normal
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Correct answer: A

12
What is the inheritance of colour blindness if both parents having a normal vision but mother has a recessive gene for colour blindness :-
Principles Of Inheritance And Variation – NEET-4697
  1. A Son - 50%, Daughter - Nil
  2. B Son - 100%, Daughter - Nil
  3. C Son - Nil, Daughter - 100%
  4. D Son -Nil, Daughter - Nil
Show answer

Correct answer: A

13
How many different types of gametes can be formed by $F _ { 1 }$ progeny, resulting from the following cross: AA BB CC x aa bb cc ?
  1. A 3
  2. B 8
  3. C 27
  4. D 64
Show answer

Correct answer: B

14
A child with mother of ' $\mathrm{A}$ ' blood group and father of '$\mathrm{AB}$' blood group will be :-
  1. A O
  2. B A
  3. C A and O
  4. D O and B
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Correct answer: B

15
A single recessive gene which can express its effect, should occur on :-
  1. A Any autosome
  2. B Any-chromosome
  3. C X-chromosome of female
  4. D X-chromosome of male
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Correct answer: D

16
The phenotype of any character will not be affected if the modified allele produces :-
  1. A Normal enzyme
  2. B Non-functional enzyme
  3. C No-enzyme at all
  4. D Both (B) and (C)
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Correct answer: A

17
Find out the correct match :-
  1. A $\mathrm{F _ { 1 }}$ resembled either of the two parents - Dominance
  2. B $\mathrm{F _ { 1 }}$ resembled in between - Incomplete dominance
  3. C $\mathrm{F _ { 1 }}$ resembled both parents-Co-dominance
  4. D All are correct
Show answer

Correct answer: D

18
The condition in which only one allele of a pair is present in a diploid organism is known as :-
  1. A Homozygous
  2. B Heterozygous
  3. C Hemizygous
  4. D Incomplete dominance
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Correct answer: C

19
According to Mendel, "factors" or "genes" -
  1. A are the units of inheritance
  2. B contain information that is required to express a particular trait
  3. C Both (A) and (B)
  4. D None of these
Show answer

Correct answer: C

20
A man with blood group B marries a female with blood group A and their first child is having blood group B . What is the genotype of child :-
  1. A $\mathrm{I^{A}}$ $\mathrm{I^{B}}$
  2. B $\mathrm{I^{A}}$ $\mathrm{I^{O}}$
  3. C $\mathrm{I^{B}}$ $\mathrm{I^{O}}$
  4. D $\mathrm{I^{B}}$ $\mathrm{I^{B}}$
Show answer

Correct answer: C

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