In cats, orange colour is due to the allele B and black colour is due to the allele b. A cat that is heterozygous (Bb) has a colouration known as tortoise shell (black and orange patches of fur). The alleles for this character are located on the X chromosome.

A. What phenotypes would be expected in the offspring resulting from a cross between a black male cat and a
tortoise-shelled female?
B. What kind of dominance relationship exists between the alleles for coat colour in these cats?