Boy is this Locus crowded! The four genes held at this location are “Ay” for Fawn, “At” for the tan and point or Tri-color gene, “a” for the solid black gene, and “aw” for sable. “Ay” and “Aw” are very similar and are dominant over, “At” and “a”, making it so the tan and point or Tri-color gene “At” and the black gene “a” are not noticeable in the dog. “At” is dominant over “a”, so if a dog is (At/a) at this Locus the dog will show the same markings as a dog that’s (At/At). If a dog is (Ay/At)(Aw/At)(Aw/a) or (Ay/a) the dog will be fawn or sable not showing the traits from the tan and point gene of the solid black gene. A Dog will only be full solid black if it carries two copies of the “a” gene (a/a). A dog whose brindle (kbr/kbr)( kbr/ky) will be brindle expressing itself over the A location. If a dog is (At/At) or (At/a) the brindling will be expressed where the tan points should be. If a dog is (Ay/At)(Aw/At)(Ay/a) or ( Aw/a) and carries 1 or 2 brindle genes the brindle will be expressed all over the dog. If a dog is (a/a) and carries 1 or 2 brindle genes the brindle is not expressed because since (a/a) is solid black and the brindle is black that allows some fawn to come though there is no fawn to let through so the brindle is not noticed. If the dog is Ky/Ky not carrying a brindle gene it allows all genes in the A location to be expressed without any interference.