GENETICS: I fully understand 36.a but I am super confused with the math behind 3

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GENETICS:

I fully understand 36.a but I am super confused with the math behind 36.b

Please show your own work leading to the answer. Will give a thumbs up.

36. Each of the four pedigrees that follow represents human family within which a genetic disease is seg regating. Affected individuals are indicated by filled- in symbols. One of the diseases is transmitted as ar autosomal recessive condition, one as an X-linked recessive, one as an autosomal dominant, and one as an X-linked dominant. Assume all four traits are rare in the population. a. Indicate which pedigree represents which mode of inheritance, and explain how you know b. For each pedigree, how would you advise the par- ents of the chance that their child (indicated by the hexagon shape) will have the condition? Pedigree1 2 2 3 4 Pedigree 2 TO 2 2 3 4 Pedigree 3 ?- . Pedigree 4TO 2

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GENETICS: I fully understand 36.a but I am super confused with the math behind 3

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