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In horses, the Extension gene helps to determine coat color. The dominant trait (E) produces black pigment in the coat. The recessive trait (e) produces red pigment. Would a cross between a stallion who is homozygous, EE, and a mare who is heterozygous, Ee, ever produce a foal with a red coat? (1 point)

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No, a cross between a stallion who is homozygous dominant (EE) and a mare who is heterozygous (Ee) would not produce a foal with a red coat.

The possible genotypes of the offspring from this cross would be:

  • From the stallion (EE), the offspring will inherit one E allele.
  • From the mare (Ee), the offspring can inherit either an E or an e allele.

The potential combinations are:

  1. EE (from E of the stallion and E of the mare) - black coat
  2. Ee (from E of the stallion and e of the mare) - black coat

Since both possible outcomes result in either EE or Ee genotypes, all foals produced from this cross will have a black coat, and none will have a red coat (which would only occur with the genotype ee).