In Drosophila, the sex is determined by

One of the parents of a cross has mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of $F_{2}$-progenies that mutation is found in

When an albino female plant of maizeis crossed with normal green male plant, all plants in the progeny are albino because

Improvement of genetic characters and present day generation on the basis of best nutrition and training is called

Who discovered $R{h^ – }$ factor