The red factor, also known as the extension gene, is indeed a gene in horses. It determines whether a horse will have a chestnut base coat color or a black or bay base coat color. The red factor is responsible for producing red pigment (phaeomelanin) and is inherited in an autosomal recessive manner. Horses with the dominant red factor allele (E) can produce black pigment, while those with the recessive red factor allele (e) will not produce black pigment and will transmit the recessive red factor allele to their offspring."
So you were right about the distribution and stuff, but technically it still is a gene |