Principles Of Inheritance And Variation — DPP 1

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
How many types & in what ratio the gametes are produced by a dihybrid heterozygous :-
  1. A 4 types in the ratio of $9 : 3 : 3 : 1$
  2. B 2 types in the ratio of $3 : 1$
  3. C 3 types in the ratio of $1 : 2 : 1$
  4. D 4 types in the ratio of 1:1:1:1
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Correct answer: D

2
Who rediscovered the results of Mendel's experiments :-
  1. A DeVries, Tschermak, Correns
  2. B DeVries, Tschermak, Morgan
  3. C Tschermak, Morgan, Correns
  4. D Tschermak, Bateson, Punnet
Show answer

Correct answer: A

3
An individual with two identical members of a pair of genetic factors is called :-
  1. A Hemizygous
  2. B Heterozygous
  3. C Nonhomologous
  4. D Homozygous
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Correct answer: D

4
The cross between recessive to it's hybrid or it's $\mathrm { F } _ { 1 }$ plant is called :-
  1. A Back cross
  2. B Test cross
  3. C Monohybrid cross
  4. D Dihybrid cross
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Correct answer: B

5
When two hybrids Ttrr & Rrtt are crossed, the phenotypic ratio of offspring shall be :-
  1. A $3 : 1$
  2. B $1 : 1 : 1 : 1$
  3. C $1 : 1$
  4. D $9 : 3 : 3 : 1$
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Correct answer: B

6
What is the genotypic and phenotypic ratio of monohybrid test cross :-
  1. A $1 : 1$
  2. B $1 : 2$
  3. C $3 : 1$
  4. D $1 : 2 : 1$
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Correct answer: A

7
Which law can be proved only by dihybrid cross?
  1. A Segregation
  2. B Purity of gametes
  3. C Dominance
  4. D Independent assortment
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Correct answer: D

8
On which plant Mendel had carried out his investigations :-
  1. A Garden - pea
  2. B Wild pea
  3. C Cow-pea
  4. D Pigeon pea
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Correct answer: A

9
If 120 Plants are produced on crossing pure red and pure white flowered pea plants, then the ratio of offsprings in $F _ { 1 }$ will be :(Red is dominant)
  1. A 90 Red : 30 White
  2. B 30 Red : 90 White
  3. C 60 Red : 60 White
  4. D All Red
Show answer

Correct answer: D

10
In monohybrid cross what is the ratio of homozygous dominant and homozygous recessive individuals in $\mathrm { F } _ { 2 }$-generation :-
  1. A $1 : 2 : 1$
  2. B $2 : 1 / 1 : 2$
  3. C $3 : 1 / 1 : 3$
  4. D $1 : 1$
Show answer

Correct answer: D

11
Which genotype represents a true dihybrid condition
  1. A tt rr
  2. B Tt rr
  3. C Tt Rr
  4. D TT Rr
Show answer

Correct answer: C

12
$\mathrm{AABbCc}$ genotype forms how many types of gametes :-
  1. A 4
  2. B 8
  3. C 2
  4. D 6
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Correct answer: A

13
In Mendel's experiments, colour of seed, colour of flower, position of flower, colour of pod, height of stem, are called :-
  1. A Alleles
  2. B Genotype
  3. C Phenotype
  4. D All of the above
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Correct answer: C

14
Mendelian ratio $9 : 3 : 3 : 1$ is due to :-
  1. A Law of segregation
  2. B Law of purity of gametes
  3. C Law of independent assortment
  4. D Law of unit characters
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Correct answer: C

15
In a dihybrid cross between $\mathrm { AABB }$ and aabb the ratio of $\mathrm { AABB } , \mathrm { AABb } , \mathrm { aaBb }$, aabb in $\mathrm { F } _ { 2 }$ generation is :-
  1. A $9 : 3 : 3 : 1$
  2. B $1 : 1 : 1 : 1$
  3. C $1 : 2 : 2 : 1$
  4. D $1 : 1 : 2 : 2$
Show answer

Correct answer: C

16
Mendel formulated the law of purity of gametes on the basis of :-
  1. A Dihybrid cross
  2. B Monohybrid cross
  3. C Back cross
  4. D Test cross
Show answer

Correct answer: B

17
Mendel's law of segregation is based on separation of alleles during :-
  1. A Gamete formation
  2. B Seed formation
  3. C Pollination
  4. D Embryonic development
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Correct answer: A

18
The percentage of ab gametes produced by $\mathrm{AaBb}$ parent will be :-
  1. A 12.5
  2. B 25
  3. C 50
  4. D 75
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Correct answer: B

19
How many characters of pea pod were chosen by Mendel?
  1. A 7
  2. B 5
  3. C 4
  4. D 2
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Correct answer: D

20
Two allelic genes are located on :-
  1. A The same chromosome
  2. B Two homologous chromosomes
  3. C Two-non-homologous chromosomes
  4. D Any two chromosomes
Show answer

Correct answer: B

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