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7. A female calico cat is crossed with a male black cat. What are the phenotypes of the offspring? 8. Also located on the X c
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7.
Female Calico cat genotype is XB Xb
Male black cat genotype is XB Y or Xb Y

The gametes from Female Calico cat are XB and Xb
The gemetes from hemizygous male Black cat are XB or Xb and Y.

Cross between female Calico cat and male black cat will result in XB XB or XBXb, XbXB and XbXb and XBY and XbY

XB XB - female black cat
XBXb - female Calico cat
XbXb - female brown cat
XBY - male Black cat
XbY - male brown cat

8.
Deafness gene is recessive , "d". This is present on X chromosome.
The genotype of Female cat which is heterozygous for deafness is XDXd
The genotype of male cat which is not deaf is XDY

The cross between them gives the offspring with the following genotypes: XDXD, XdXD, XDY and XdY.
25 % - female cat which is not deaf,
25 % - female cat which is heterozygous for deafness or heterozygous Normal
25 % - male cat which is hemizygous normal
25 % - male cat which is hemizygous deaf

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