Principles Of Inheritance And Variation — DPP 21

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
The law of dominance is used to explain the expression of only one of the parental characters in a monohybrid cross in $\_\_\_\_$ and the expression of both in $\_\_\_\_$ .
  1. A $\mathrm{F _ { 1 }}$ and $\mathrm{F _ { 2 }}$
  2. B $\mathrm{F _ { 2 }}$ and $\mathrm{F _ { 3 }}$
  3. C $\mathrm{F _ { 1 }}$ and $\mathrm{F _ { 3 }}$
  4. D $\mathrm{F _ { 2 }}$ and $\mathrm{F _ { 1 }}$
Show answer

Correct answer: A

2
Which statement is incorrect :-
  1. A Pleotropic gene has multiple phenotype
  2. B $9 : 7$ ratio is produced due to co-dominance
  3. C Two identical alleles known as homozygous
  4. D Incomplete dominance is present in Antirrhinum majus
Show answer

Correct answer: B

3
A plant with genotype AaBbCc is crossed with AAbbCc , what would be the phenotypic ratio-
  1. A $9 : 3 : 3 : 1$
  2. B $1 : 2 : 1 : 2 : 4 : 2 : 1 : 1 : 2 : 1$
  3. C $1 : 2 : 1 : 1 : 2 : 1$
  4. D $3 : 1 : 3 : 1$
Show answer

Correct answer: D

4
Mendelian dihybrid and dihybrid with linkage are respectively related with how many chromosomes :-
  1. A 1 pair & 2 pair
  2. B 2 pair & 1 pair
  3. C 2 pair & 2 pair
  4. D 1 pair & 1 pair
Show answer

Correct answer: B

5
Match the column-I with column-II and select the correct answer using codes given below:-
Principles Of Inheritance And Variation – NEET-5177
  1. A A-ii, B-i, C-iv, D-iii
  2. B A-ii, B-i, C-iii, D-iv
  3. C A-iv, B-ii, C-i, D-iii
  4. D A-ii, B-iii, C-iv, D-i
Show answer

Correct answer: D

6
Given below are two statements:
Statement-I : Modified allele could be responsible for production of normal enzyme.
Statement-II : Normal/unmodified allele is responsible for production of normal enzyme.
In the light of the above statements, choose the most appropriate 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: D

7
When pure green pod colour garden pea plant is crossed with yellow pod colour plant, then yellow pod colour plants obtained in $\mathrm { F } _ { 2 }$ generation will be :-
  1. A $75 \%$
  2. B $50 \%$
  3. C $25 \%$
  4. D $37.5 \%$
Show answer

Correct answer: C

8
What will be the percentage inheritance of a disorder from an X-linked diseased father to his son.
  1. A $0 \%$
  2. B $25 \%$
  3. C $50 \%$
  4. D $100 \%$
Show answer

Correct answer: A

9
In monohybrid cross, What is the possibility of obtaining genotype TT , tt and Tt respectively in $\mathrm { F } _ { 2 }$ generation :
  1. A $3 / 4,1 / 4,1 / 2$
  2. B $1 / 4,1 / 4,1 / 2$
  3. C $1 / 4,1 / 2,1 / 4$
  4. D $1 / 2,1 / 2,1 / 4$
Show answer

Correct answer: B

10
Two genes a and b are linked and show $30 \%$ recombination. If ++ / ++ individual married with $\mathrm { ab } / \mathrm { ab }$ then the types and proportion of gametes produced by $\mathrm {F} _ {1}$ will be -
  1. A $+ + 35 \% :$ ab $: 35 \% : +$ a $15 \% : +$ b $15 \%$
  2. B $+ + 15 \% :$ ab $: 15 \% : +$ a $35 \% : +$ b $35 \%$
  3. C $+ + 35 \% :$ ab $: 15 \% : +$ a $35 \% : +$ b $15 \%$
  4. D $+ + 15 \% :$ ab $: 35 \% : +$ a $15 \% : +$ b $35 \%$
Show answer

Correct answer: A

11
Which statement is not correct regarding the sickle cell anaemia :-
  1. A This is autosomal linked recessive trait
  2. B Heterozygous $\left( \mathrm { Hb } ^ { \wedge } \mathrm { Hb } ^ { s } \right)$ are resistant to malarial disease
  3. C Heterozygous ( $\mathrm { Hb } ^ { \wedge } \mathrm { Hb } ^ { s }$ ) individuals are diseased phenotype
  4. D Defect is caused by the substitution of glutamic acid (Glu) by valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule
Show answer

Correct answer: C

12
Read the all statements carefully :
(i) Mendel conducted artificial pollination /cross pollination experiments using several true breeding pea line
(ii) True breeding having undergone continuous self pollination, show stable trait inheritance
(iii) Mendel selected 14 true breeding pea plant varieties.
  1. A Only i and iii are correct
  2. B i, ii and iii are correct
  3. C Only iii is incorrect
  4. D i and ii are incorrect
Show answer

Correct answer: B

13
Which statement is correct about polygenic inheritance :-
  1. A One character is controlled by many genes
  2. B Characters controlled by cytogenes
  3. C Two pair of allelic genes are essential in dominant form to produce a particular character
  4. D Gene which inhibit the expression of another non allelic gene
Show answer

Correct answer: A

14
A monohybrid cross between two plants, one having 24 cm long internode and other having 12 cm long internode, produces $\mathrm { F } _ { 1 }$ hybrid, all having 18 cm long internodes. This is a case of
  1. A Complete dominance
  2. B Incomplete dominance
  3. C Co-dominance
  4. D Multiple allelism
Show answer

Correct answer: B

15
How many kinds of gametes can be produced by an individual of genotype $\frac { A } { a } \frac { B } { b } \frac { C } { c } \frac { D } { d } \frac { E } { e } \frac { F } { f }$
  1. A 32
  2. B 16
  3. C 8
  4. D 4
Show answer

Correct answer: A

16
Which of the following gametic combination will not form in plant having AaBbCc genotype, in which A & B genes show complete linkage & cis arrangement ?
  1. A ABC
  2. B ABc
  3. C abC
  4. D aBC
Show answer

Correct answer: D

17
Ratio of dominant and recessive for both character plants in $\mathrm{F _ { 2 }}$ generation of dihybrid cross is :-
  1. A $1 : 1$
  2. B $5 : 3$
  3. C $9 : 1$
  4. D $3 : 1$
Show answer

Correct answer: C

18
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
  1. A Alleles do not show any blending and both the characters recover as such in $\mathrm{F}_{2}$-generation.
  2. B Factors occur in pairs.
  3. C The discrete unit controlling a particular character is called a factor.
  4. D Out of one pair of factors one is dominant and the other recessive.
Show answer

Correct answer: A

19
In pedigree analysis the symbol represents :-
Principles Of Inheritance And Variation – NEET-5291

  1. A Consanguineous marriage
  2. B Sex unspecified
  3. C Monozygotic twin
  4. D Dizygotic twin
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Correct answer: C

20
How many statements are correct about Mendel-
A. Mendel performed his experiments for seven years during 1956-1963.
B. Mendel considered 7 traits of 14 characters for his experiments.
C. His results allowed him to set up a basic framework of rules governing inheritance, which was expanded on by later scientists to account for all the diverse natural observations and the complexity inherent in them.
D. A true-breeding line is one that, having undergone continuous cross-pollination.
E. Mendel selected 14 true-breeding pea plant varieties, as pairs which were different except for one character with contrasting traits.
  1. A A, B and C
  2. B C, D and E
  3. C C and D
  4. D C only
Show answer

Correct answer: D

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