The inheritance of flower colour in dog flower and 4’O clock plant exhibits:

1. Complete dominance

2. Incomplete dominance

3. Co-dominance

4. Lethality

Subtopic:  Dominance Deviation from Mendel: 1 |
 93%
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In complete dominance, the recessive allele with respect to the dominant allele:

1. Produces no product

2. Produces a different product

3. Produces half the product

4. Produces no product or a non-functional product

Subtopic:  Dominance Deviation from Mendel: 1 |
 66%
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The number of alleles, the genotypic combinations and phenotypes in ABO system is respectively:

(1) 3, 6 and 4

(2) 3, 4 and 6                            

(3) 2, 3 and 4            

(4) 2, 3, and 6

Subtopic:  Dominance Deviation from Mendel: 2 |
 84%
From NCERT
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Suppose a gene has seven alleles. What would be the number of alleles in an individual at any instant?

(1) 1

(2) 7

(3) 2

(4) 3

Subtopic:  Dominance Deviation from Mendel: 2 |
 58%
From NCERT
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In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?

(1) The gene B mutates at a faster rate.

(2) The gene B is easily influenced by the environment

(3) Dominance is not an autonomous feature of a gene or the product that it has information for

(4) Some genes do not follow the law of segregation

Subtopic:  Dominance Deviation from Mendel: 1 |
 83%
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When Mendel self hybridized F1 progeny of a dihybrid cross between pure Yellow Round seeded plants and Green Wrinkled plants, he observed that yellow and green colour segregated in a ratio of:

(1) 1 : 1

(2) 3 : 1

(3) 9 : 3 : 3 : 1

(4) 1 : 2 : 1

Subtopic:  Dihybrid Cross: Details |
 52%
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In 1900 Mendel’s work was rediscovered by:

1. Korana, Nirenberg and Mathei

2. De Vries, Correns and von Tschermak

3. Avery, McCleod and McCarty

4. Watson, Crick and Wilkins

Subtopic:  Monohybrid Cross: 1 |
 91%
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Genes tightly linked on the same chromosome show:

(1) Very high recombination

(2) Independent assortment

(3) Very low recombination

(4) 50 % recombination

Subtopic:  Linkage |
 88%
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In humans, the mechanism of sex determination is:

(1) XX – XY; male heterogamety

(2) XX – XY; female heterogamety

(3) XX – XO; male heterogamety

(4) XX – XO; female heterogamety

Subtopic:  Sex Determination |
 94%
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A couple has a daughter. What is the probability that their next child will be a daughter?

(1) 0 %

(2) 25 %

(3) 50 %

(4) 100 %

Subtopic:  Sex Determination |
 93%
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