Principles Of Inheritance And Variation — DPP 13

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 fact that the alleles do not show any blending and that both the characters are recovered as such in $\mathrm{F _ { 2 }}$ generation, become the basis of :-
  1. A Law of Dominance
  2. B Law of paired factors
  3. C Law of segregation
  4. D Law of independent assortment
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Correct answer: C

2
Parallelism between chromosome and behaviour of gene was established by :-
  1. A de Vries, Correns and Tschermak
  2. B Sutton and Boveri
  3. C Bateson and Punnet
  4. D Landsteiner and de Castello
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Correct answer: B

3
In a dihybrid cross where two parents differ in two pairs of contrasting traits like seed colour yellow (YY) and seed colour green (yy) with seed shape round (RR) and seed shape wrinkled (rr). The number of green coloured seeds ( yy ) among sixteen products of $\mathrm{F _ { 2 }}$ generation will be :-
  1. A 2
  2. B 4
  3. C 6
  4. D 8
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Correct answer: B

4
Heterozygous tall plants were crossed with dwarf plants. What will be the ratio of dwarf plants in the progeny :-
  1. A $50 %$
  2. B $25 %$
  3. C $75 %$
  4. D 100%
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Correct answer: A

5
In monohybrid cross proportion of $3 : 1$ explains :-
  1. A Dominance
  2. B Segregation
  3. C Both (A) and (B)
  4. D Unit factor
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Correct answer: C

6
If a normal woman marries an albino man and their offsprings are half albino, half normal the woman is :-
  1. A Homozygous normal
  2. B Heterozygous normal
  3. C Homozygous recessive
  4. D Homozygous dominant
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Correct answer: B

7
Which of the following structure was discovered by Henking ?
  1. A y-body
  2. B Bar body
  3. C x-body
  4. D Nu-body
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Correct answer: C

8
In dihybrid mendelian cross how many types of genotype and phenotype will be obtained :-
  1. A 4 and 9 respectively
  2. B 9 and 4 respectively
  3. C 9 & 16 respectively
  4. D 4 & 16 respectively
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Correct answer: B

9
A man and woman are both affected by vitamin D resistance rickets, which is a dominant sex-linked allele. All the female offsprings of this couple are affected with rickets but some of the male offsprings are not. What are the genotypes of the parents?
  1. A Both are homozygous for the trait.
  2. B The woman has two dominant alleles and man has one dominant allele.
  3. C Both parents have only recessive alleles.
  4. D Each parent has only one dominant allele.
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Correct answer: D

10
In this given pedigree what is the mode of inheritance?
Principles Of Inheritance And Variation – NEET-4925
  1. A Autosomal dominant
  2. B Autosomal recessive
  3. C X-linked dominant
  4. D X-linked recessive
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Correct answer: B

11
Shape of seed depends on starch granules size, so inheritance of seed shape show $\_\_\_\_$ relationship while inheritance of starch grains show $\_\_\_\_$ .
  1. A Dominant recessive, codominance
  2. B Incomplete dominance, codominance
  3. C Dominant - recessive, incomplete dominance
  4. D Codominance, incomplete dominance
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Correct answer: C

12
Genetic disorders determined by alteration or mutation in single gene are known as :-
  1. A Chromosomal disorders
  2. B Mendelian disorders
  3. C Non inheritable disorders
  4. D All the above
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Correct answer: B

13
Test cross involves :-
  1. A Crossing between two genotypes with recessive trait
  2. B Crossing between two $\mathrm{F _ { 1 }}$ hybrids
  3. C Crossing the $\mathrm{F _ { 1 }}$ hybrid with a double recessive genotype
  4. D Crossing between two genotypes with dominant trait
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Correct answer: C

14
Phenotype of an organism is the result of :-
  1. A Mutations and linkages
  2. B Cytoplasmic effects and nutrition
  3. C Environmental changes and sexual dimorphism
  4. D Genotype and environment interactions
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Correct answer: D

15
The association of parental characters combinations in the offsprings of a dihybrid is excess to non-parental combinations is said to be due to :-
  1. A Co-dominance
  2. B Blending inheritance
  3. C Linkage
  4. D Duplicate genes
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Correct answer: C

16
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in male. It proves :-
  1. A In human beings $Y$-chromosome is active in sex determination.
  2. B Y-chromosome is active in sex determination in both human beings and Drosophila.
  3. C In Drosophila Y-chromosome decides femaleness.
  4. D Y -chromosome of man has genes for syndrome.
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Correct answer: A

17
Select the incorrect statement for Gregor Mendel :-
  1. A He conducted hybridization experiments on garden pea for seven years.
  2. B He applied statistical analysis and mathematical logic for the first time to the problems in biology.
  3. C His experiments had a small sampling size.
  4. D He conducted artificial cross-pollination experiments using several truebreeding pea lines.
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Correct answer: C

18
Mendelian disorder are mainly determined by:
  1. A Alteration or mutation in single gene
  2. B Absence of one chromosome
  3. C Excess of one of more chromosome
  4. D All the above
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Correct answer: A

19
Which symbol of pedigree is correctly matched?
Principles Of Inheritance And Variation – NEET-4918
  1. A Female
  2. B affected offspring
  3. C Affected male of autosomal recessive disease
  4. D Marriage between relatives
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Correct answer: D

20
On crossing red & white flowered plants the ratio of red and white flowered plants in $\mathrm{F_{2}}$-generation was 60:20, then on selfing the heterozygous red flowered plants, the offsprings would be :-
  1. A $72 : 24$
  2. B $40 : 60$
  3. C $52 : 48$
  4. D $84 : 16$
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Correct answer: A

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