Where are the cytoplasmic genes for male sterility typically located?

$A$ gene that suppresses the effect of another gene,and which is not located at the same locus on homologous chromosomes,is called:

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:

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 $F_2$ progenies,that mutation is found in

Define / Explain: Complementary Gene.

The $9 : 3 : 3 : 1$ ratio is modified to $9 : 7$ ratio due to