Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait? a. both parents are homozygous for the recessive allele and have the trait. b. both parents are homozygous for the recessive allele but do not have the trait. c. both parents are heterozygous for the recessive allele and have the trait. d. both parents are heterozygous for the recessive allele but do not have the trait.