Biology Practice Problems Genetic Counseling Practice Problems Solution: Retinitis pigmentosum (RP) is a rare inherited con...

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Solution: Retinitis pigmentosum (RP) is a rare inherited condition that eventually results in the loss of night vision. The pedigrees below describe three families with a history of RP.a. Explain from the pedigrees of Families A, B, and C how RP is inherited. Be sure you can account for all individuals.

Problem

Retinitis pigmentosum (RP) is a rare inherited condition that eventually results in the loss of night vision. The pedigrees below describe three families with a history of RP.

a. Explain from the pedigrees of Families A, B, and C how RP is inherited. Be sure you can account for all individuals.

Solution

For the whole pedigree, it can be seen that out of 15 people affected, only 2 are females. Moreover, both these females only appeared in the fourth generation. With that in mind, it is easy to conclude that this is not a Y-linked trait, as these are also expressed with females. 

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