Which of the following statements best explains why sheep X has black wool? a. Black wool is a recessive trait, and sheep X is heterozygous for wool color. b. Black wool is a dominant trait, and sheep X is homozygous dominant for wool color. c. Black wool is a dominant trait, and sheep X is heterozygous for wool color. d. Black wool is a recessive trait, and sheep X is homozygous recessive for wool color.