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Homozygous means 2 of the same. When a stallion is homozygous for the tobiano gene, it means that he has
2 tobiano genes. One was inherited from the sire, and one from the dam.
Since he has 2 tobiano genes, one of them will always be given to the foal. The foal will
inherit the other gene from the dam. The tobiano gene is a domiant gene, so the foal should ALWAYS be a tobiano.
If the dam is a tobiano mare, the foal will have a 50% chance of being homozygous. If the mare is solid,
or an overo, it is not possible to have a homozygous foal. The homozygous horse must have both parents tobiano.
What if the stallion that you choose for your mare is NOT homozygous?
When you breed a solid mare to a tobiano stallion that is NOT homozygous, you have a 50% of a tobiano foal and
a 50% chance that the foal will be solid.
When you breed a tobiano mare to a tobiano stallion that is NOT homozygous
you can end up with a homozygous foal but the chances are 25%. There is also a 25% chance that the foal will be solid.
50% of the foals should be non homozygous tobianos.
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