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In cats, the B allele codes for black fur, and the b allele codes for yellow...

In cats, the B allele codes for black fur, and the b allele codes for yellow fur. The gene is located on the X-chromosome. However, the genotype Bb results in fur with a mottled appearance called tortoise-shell.

a. Suppose a tortoise-shell female is crossed with a black male. What offspring would be expected?

b. Would you expect any tortoise-shell males to be produced? Explain.

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Answer #1

A - Given that female is tortoise-shell, it means that she is both B and b allele. Male is black. So he has only B allele.

Male has one X chromosome and female has two X chromosome.

As shown in the genotype female is XBXb and XBXB and that of male us XBY and XbY

So expected phenotypes are - Black and tortoise-shell female and Black and yellow male.

B - For tortoise-shell, a person should have B and b allele on their X-chromosome.

Since male has only one copy of X-chromosome, so they either by Black or yellow fur, not tortoise-shell fur. SO, we cannot expect any tortoise-shell males to be produced.

Please write to me if you need more help.

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