If curly hair (c) is a dominant trait, what are the genotypes of the parents in the pedigree? a. both parents are homozygous (cc) for the curly hair trait. b. one parent is heterozygous (cc) for the curly hair trait, and the other parent is homozygous for the curly hair trait (cc). c. both parents are heterozygous (cc) for the curly hair trait. d. one parent is homozygous for the curly hair trait (cc), and the other parent is homozygous for non-curly hair (cc).