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A true blue roan is a black horse with the roan gene. In order for the horse to be black it has to be aa at the agouti site and either Ee or EE at the extension site.

aaEeRn- or aaEERn- the second allele at the roan site is unknown.

The chestnut horse has to be ee at the extention site. Unfortunately, without some

knowledge of the colors of the parents of both these horses it will be difficult to determine the probability of color.

We do know that there is a minimum of a 50% chance that any foal produced will be roan. (If both parents of the roan are roans themselves there is a potential for the roan horse to be RnRn.) If the roan parent is RnRn any foal produced from this mating would be roan.

We also know that, if the blue roan is Ee at the extension site there is a 50% chance that any foal produced will be chestnut (whether with or without roaning). (If either of the blue roan's parents were chestnut we would know that the roan parent is Ee.)

We know that the blue roan is aa at the Agouti site, but without further study of the

chestnut's parents, grand parents and her and their offspring it would be difficult to know if the mating could produce a Bay (A).

If the chestnut parent is Aaee 50% of the non chestnut foals will be Bay and 50% will be black.

Hope this helps.

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Q: What color foal should you have between a blueroan horse and chestnut?
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