On a separate piece of paper, draw a simple family tree for a couple showing chi

Question

On a separate piece of paper, draw a simple family tree for a couple showing children (F1), and
lineages from two children showing grand children (G2), great grandchildren (G3), great great
grandchildren (G4), and great great great grandchildren (G5). For the basic family tree, assume
generations are outcrossed to non-related spouses. G5 relations between the two lineages would be 3rd
cousins. Assume that one of the original couple is a carrier for a genetic disease.
b. For each generation after the F1, what is the chance that an individual from each generation is a
carrier.
c. For each generation after the F1, if a pair of cousins were to marry, calculate the chance that a child
born to them is affected.

Explanation / Answer

disease is of recessive type, g1= A/ * A/a

g2=A/a A/a A/a A/ A/ a/a

g3= A/a A/a

g4= a/a (affected)

in g1 generation a probability of affected child is 0 but for carrier it is 50%, in g2 generation the ratio of carrier and affeted is 2;1 this disorder skips generations and appears in an mating between two related individuals.

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