In Labrador retrievers, coat color is controlled by two interacting loci. The E locus is epistatic over the B locus and determines if the coat is dark (black) or light (yellow). The recessive genotype at the B locus acts to dilute a dark colored coat to chocolate. Note that the underline (_) implies the specific allele at the locus is unknown. a. A chocolate female, born from a yellow mother, is mated to a black male known to be heterozygous at both loci. What genotypic and phenotypic ratios do you expect in their progeny?