A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

• AaBb

• AaBB

• AABb

• AABb

A common test to find the genotype of a hybrid is by

• crossing of one F₂ progeny with male parent

• crossing of one F₂ progeny with female parent

• studying the sexual behaviour of F₁ progenies

• studying the sexual behaviour of F₁ progenies

Inheritance of skin colour in humans is an example of

• chromosomal aberration

• point mutation

• polygenic inheritance

• polygenic inheritance

Two genes R and Y are located very close on the chromosomal linkage map of a maize plant. When RRYY and rryy genotypes are hybridised, the F₂ segregation will show:

• higher number of the recombinant types.

• segregation in the expected 9 : 3 : 3 : 1 ratio

• segregation in 3 : 1 ratio

• segregation in 3 : 1 ratio

Haploids are more suitable for mutation studies than the diploids. This is because 

• Haploids are reproductively more stable than diploids

• mutagens penetrate in haploids more effectively than is diploids

• haploids are more abundant in nature than diploids

• haploids are more abundant in nature than diploids