Gene B located on X chromosome in quinea pigs determine either black

Gene B located on X chromosome in quinea pigs determine
either black (B allele) or orange (b allele) color.
Heterozygous quinea pigs are tortoise -shell. Explain if both
males and females can be tortoise -shell. What would be all
possible genotypes for guinea pigs if they are also
heterozygous for gene S that determines the presence of
spots (S allele) or absence of spots (s allele)?
im pretty sure the answer to the first question is only
females b/c males only have one x chromosome and
therefore are not able to be heterozygous for gene B, but
not so sure about the 2nd question
I believe S is assumed in this case to be located on an
The answer for first question is only females can be
tortoise shell. For males, there i s only one \’X\’
chromosome and the possible genotypes will be XB Y and
Xb Y which will be black and orange respectively. For
females, there are three possibilities XBXB (Black), XBXb
(Tortoise shell) and XbXb (orange).
Assuming that \’S\’ also locates in \’X\’ chromosome, then
in question they are asking for the all the genotypes
Genotypes for male: XS Y and Xs Y
Genotypes for female: XSXS, XSXs and XsXs

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