Because a cat must have both orange and non-orange alleles to be tortoiseshell (see
Chapter 11, Problem 15(choose chapter or problem)
Because a cat must have both orange and non-orange alleles to be tortoiseshell (see Figure 11.4), we would expect only female cats, which have two X chromosomes, to be tortoiseshell. Normal male cats (XY) can carry only one of the two alleles. Male tortoiseshell cats are rare and usually sterile. What might you guess their genotype to be?
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