Principles Of Inheritance And Variation — DPP 4

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
If a heterozygous tall plant is crossed with a homozygous dwarf plant then what shall be the percentage of dwarf offsprings :-
  1. A $25 \%$
  2. B $100 \%$
  3. C $75 \%$
  4. D $50 \%$
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Correct answer: D

2
A cross between AaBB X aaBB yields a genotypic ratio of :-
  1. A 1 AaBB: 1 aaBB
  2. B 1 AaBB : 3 aaBB
  3. C 3AaBB : 1 aa BB
  4. D All AaBb
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Correct answer: A

3
If a cross is made between AA and aa, the nature of $\mathrm{F _ { 1 }}$ progeny will be :-
  1. A genotypically AA, phenotypically a
  2. B genotypically Aa, phenotypically a
  3. C genotypically Aa, phenotypically A
  4. D genotypically aa, phenotypically A
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Correct answer: C

4
If a homozygous tall plant is crossed with a dwarf plant, what shall be the ratio of plants in offsprings :-
  1. A All heterozygous tall
  2. B Two tall & Two dwarf
  3. C $1 : 2 : 1$
  4. D All homozygous dwarf
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Correct answer: A

5
How many types of gametes are expected from the organism with genotype $\mathrm{AABBCC}$:-
  1. A One
  2. B Two
  3. C Four
  4. D Eight
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Correct answer: A

6
When a red flower homozygous pea plant is crossed with a white flower plant what colour is produced in $\mathrm{F _ { 1 }}$ generation:-
  1. A Red
  2. B White
  3. C Pink
  4. D Red + white
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Correct answer: A

7
A plant of $\mathrm{F _ { 1 }}$ generation with genotype "$\mathrm{AABbCC}$". On selfing of this plant what is the phenotypic ratio in $\mathrm{F _ { 2 }}$ generation :-
  1. A $3 : 1$
  2. B $1 : 1$
  3. C $9 : 3 : 3 : 1$
  4. D $27 : 9 : 9 : 9 : 3 : 3 : 3 : 1$
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Correct answer: A

8
A pure tall and a pure dwarf plant were crossed to produce offsprings. Offsprings were self crossed, then find out the ratio between true breeding tall to true breeding dwarf :-
  1. A $1 : 1$
  2. B $3 : 1$
  3. C $2 : 1$
  4. D $1 : 2 : 1$
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Correct answer: A

9
In a cross between a pure tall plant with green pod & a pure short plant with yellow pod. How many short plants are produced in $F _ { 2 }$ generation out of 16 :-
  1. A 1
  2. B 3
  3. C 4
  4. D 9
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Correct answer: C

10
A and B genes are completely linked. What shall be genotype of progeny in a cross between $\mathrm { AB } / \mathrm { ab }$ and $\mathrm { ab } / \mathrm { ab }$ :-
  1. A AAbb and aabb
  2. B AaBb and aabb
  3. C AABB and aabb
  4. D None
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Correct answer: B

11
In a certain taxon of insects some have 17 chromosomes and the other have 18 chromosomes. The 17 and 18 chromosome bearing organisms are :-
  1. A Male and females, respectively
  2. B Females and males, respectively
  3. C All males
  4. D All females
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Correct answer: A

12
Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900 due to the reason (s):
(A) Communication was not easy in those days.
(B) His contemporaries did not accept factors as discrete units of heredity.
(C) Mathematical approach to explain inheritance was totally new.
(D) Mendel could not provide any physical proof for the existence of factors
  1. A Only A and B are correct
  2. B Only B and C are correct
  3. C Only C and D are correct
  4. D All are correct
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Correct answer: D

13
Inheritance of starch grains size shows :-
  1. A Dominant recessive relationship
  2. B Codominance
  3. C Incomplete dominance
  4. D Multiple allelism
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Correct answer: C

14
The frequency of an autosomal recessive allele is 0.4 . Then what will be the frequency of heterozygotes in progeny among 4000 individual?
  1. A 2000
  2. B 1920
  3. C 2400
  4. D 1600
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Correct answer: B

15
Which genotype ratio will appear by the trihybrid test cross in a plant having completely linked genes :-
  1. A $1 : 1 : 1 : 1 : 1 : 1 : 1 : 1$
  2. B $1 : 1 : 1 : 1$
  3. C $1 : 1$
  4. D $1 : 2 : 1$
Show answer

Correct answer: C

16
Drosophila melanogaster has :-
  1. A 2 pairs of autosomes and 1 pair of sex chromosomes
  2. B 3 pairs of autosomes and 3 pairs of sex chromosomes
  3. C 1 pairs of autosomes and 3 pairs of sex chromosomes
  4. D 3 pairs of autosomes and 1 pairs of sex chromosomes
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Correct answer: D

17
Assertion (A) : Starch synthesis gene in Heterozygous (Bb) produce intermediate size starch grains but round seed.
Reason (R) : Gene for starch branching enzyme (SBE) show multiple allelism.
In the light of the above statements, choose the correct answer from the options given below :
  1. A Both (A) & (R) are correct but (R) is not the correct explanation of (A).
  2. B (A) is correct but (R) is not correct.
  3. C (A) is not correct but (R) is correct.
  4. D Both (A) & (R) are correct and (R) is the correct explanation of (A).
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Correct answer: B

18
If the frequency of recesive phenotype is $9 \%$ then find out the number of homozygous organisms in population of 50,000 individuals:-
  1. A 42,000
  2. B 29,000
  3. C 4500
  4. D 24,500
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Correct answer: B

19
A homozygous recessive with cd genes was crossed with dominant ( + + ). If their hybrid is test crossed and the following results were obtained
Principles Of Inheritance And Variation – NEET-5274 than what will be the distance between genes c and d .
  1. A 5.75 unit
  2. B 11 unit
  3. C 44 unit
  4. D 90 unit
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Correct answer: B

20
Thalassemia is differ from sickle cell anaemia because :-
  1. A Thalassemia is a qualitative disease
  2. B Thalassemia is a quantitative disease
  3. C Thalassemia is an autosomal dominant disease
  4. D Thalassemia is a chromosomal disorder
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Correct answer: B

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