A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh :-

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F₂ progenies that mutation is found in -

A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-