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

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

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

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:

In 1900 Mendel’s work was rediscovered by:

Genes tightly linked on the same chromosome show:

In humans, the mechanism of sex determination is:

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 %

Thalesemia is inherited as a/an ____________ condition.

The point mutation in sickle cell anaemia leads to a change in codon. Identify the correct change: