Simon has curly hair. if he is homozygous for the gene that determines curly hair, what is true of his parents? ?
a. ? one must have a recessive allele for straight hair, while the other must have a dominant allele for curly hair.
b. ? they must both have mutated dominant genes for straight hair
c. ? they must each have a recessive allele for straight hair.
d. ? they must each have a recessive allele for curly hair.