What colour foal would you get if bred a gray stallion and black mare?

You can't predict the exact color of the foal with certainty, but here's why:

* Gray is a dominant gene: This means a gray horse will always carry the gray gene.

* Black is a recessive gene: This means a black horse needs two copies of the black gene.

Possible Foal Colors:

* Gray: The most likely outcome. The gray stallion will pass on the gray gene, which is dominant over the black gene.

* Black: While less likely, the mare could have carried a hidden gray gene. If she did, the foal would be black.

Why you can't know for sure:

* Unknown mare's genetics: Even if the mare is black, we don't know if she is homozygous black (BB) or heterozygous (Bb). If she's heterozygous, she carries a hidden gene for another color.

* Other color genes: Horses have many other genes that influence coat color. Even if a foal is gray or black, it could have subtle markings or variations due to these other genes.

In summary: A gray stallion and black mare are most likely to produce a gray foal, but there's a chance the foal could be black depending on the mare's genetics.