Dosage compensation in mammals typically involves the random inactivation of one of the two X chromosomes relatively early in development. Such X chromosome inactivation often leads to phenotypic mosaicism. Assume that black fur in cats is due to the X-linked recessive gene b, whereas its dominant allele B priduces yellow fur. A Bb heterozygote is a mosaic called "tortoise shell" or "calico: depending on the presence of at least one autosomal allele S. Using appropriate gene symbols, diagram a mating between a black male and a calico female (SS).

Question

anonymous · Answer

give the phenotypes and genotypes of all the offspring

anonymous · Answer

hi I'm just kinda here :)

aaronq · Answer

We can see that the male black cat is bb, and the female calico is Bb.

But I dont see how you could infer the autosomal genotype of the male for the S allele. We're told the female is SS, but what about the male?