In cats having hair dominant (H) over not having hair (h). If a male cat that is hetrozygous for hair is crossed with hairless cat.

What are the parents genotypes?

A heterozygous cat has a genotype Hh

A hairless cat has a genotype hh

When crossed, the results could be any of the following:

Hh (with hair)

hh (hairless)

There is a 50:50 chance or 1: 1 ratio that the offspring will have hair.