13. (2 points) (application) Albinism is inherited through a recessive allele (a

Question

13. (2 points) (application) Albinism is inherited through a recessive allele (a). Michael has normal skin color. His Mom and Dad also have normal skin color. Michael marries Brianna, who also has normal skin color. Surprisingly, their first child is an albino. What is everyone's genotype? Reminder: No guessing in genetics. Michael_ Brianna What is the probability that their next child will be an albino?Show your work Michael's Mom Michael's Dad Michael and Brianna's first child in a Punnett square. Circle and label your answer in the Punnett square.

Explanation / Answer

Genotype of Michael : Aa

Michael's Mom : AA/Aa

Michael's Dad: AA/Aa

Brianna : Aa

Michael's and Brianna's first child : aa

As it is an autosomal recessive character it means that an individual will only be affected when he or she recieves both the recessive copy of allele.

Michael and her wife Brianna were having an affected child but they were normal it means that they were the carrier (Aa).

and Michael can only be carrier if his both the parents were carrier or any one of them was carrier either mother or father.

So their is always an probability of 1/4 of their child being affected.

Michael's / Brianna A a A AA AA a Aa aa

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