What is A cat homozygous for black fur color crossed with a that white color?

This is a classic example of Mendelian genetics! Here's how we can break it down:

* Homozygous: This means the cat has two identical alleles (versions of a gene) for fur color. Since it's homozygous for black fur, we can represent its genotype as "BB".

* Heterozygous: A cat with one allele for black fur and one for white fur would be heterozygous.

* Alleles: Let's use "B" for the black fur allele and "W" for the white fur allele.

The Cross:

* Parent 1: BB (black fur)

* Parent 2: WW (white fur)

Possible Offspring Genotypes:

When we cross these parents, each parent contributes one allele to their offspring:

* BW (all offspring will have this genotype)

Possible Offspring Phenotypes:

* Black fur: Since the black fur allele (B) is dominant, all offspring will have black fur, even though they carry the recessive white fur allele (W).

In summary:

When a cat homozygous for black fur is crossed with a cat homozygous for white fur, all offspring will inherit one black fur allele (B) and one white fur allele (W), resulting in a genotype of BW and a black fur phenotype.