The expression of genes for the production of milk in only females is a

When one pair of genes suppresses the effect of another pair,the phenomenon is known as:

Who discovered epistasis?

In sweet pea plants,the presence of dominant $C$ and $P$ genes is essential for the development of purple colour. The ratio of plants producing flowers of different colours in the progeny of the cross $CcPp \times Ccpp$ will be:

The example of epistatic gene is shown by

In which one of the following, complementary gene interaction ratio of $9: 7$ is observed?