Albinism is caused by an autosomal recessive allele that interferes with skin pigmentation in mammals. Two normally pigmented parents already have an albino boy. They plan to have 2 more children
Albinism is caused by an autosomal recessive allele that interferes with skin pigmentation in mammals. Two normally pigmented parents already have an albino boy. They plan to have 2 more children.
a) What is the probability that their next two children will be normally pigmented? Show your work.
b) What is the probability that their next two children will both have albinism? Show your work.
c) What is the probability that, when they have 2 more children, they will end up with a family including a total of 2 albino children and one normal? Show your work.
d) What is the probability that, when they have two more children, the next child (i.e. the second-born child) will be normal, followed by a child with albinism? Show your work.
e) Explain why the answers to part (c) and part (d) are calculated differently.
Albinism is an autosomal recessive trait.
Both the parents are Aa.
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