Since I use the terms "homozygous" and "heterozygous" quite a bit, I thought I should offer a short definition.
A horse that is heterozygous carries one copy of a particular gene*. The horse will produce a foal carrying the gene 50% of the time when bred to a horse without the gene. Heterozygous cream dilutes are: palominos, buckskins, and smokey blacks.
A horse that is homozygous carries two copies of a particular gene*. The horse will produce a foal carrying the gene 100% of the time whether or not the horse it is bred to carries the gene. In order for a horse to be homozygous for ANY gene, both of the horse's parents must have the gene and pass it. Homozygous cream dilutes are: cremellos, perlinos, and smokey creams.
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