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?
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