SOLUTION: genetic problem: Schilder's disease, which causes a progressive degeneration on the nervous system leading to death at about two years of age, behaves as a simple autosomal recess

Question 132408: genetic problem:
Schilder's disease, which causes a progressive degeneration on the nervous system leading to death at about two years of age, behaves as a simple autosomal recessive trait.If a couple loses their first two children due to Schilder's disease, what is the chance that their third child will develop the disease? S=normal and s=Schilder's disease.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Both parents have to be heterozygous for the trait.
So, Ss + Ss
= SS Ss sS ss
One out of 4 children will have ss and die of the disease.
The chance of their 3rd child getting the disease is 1/4.
.
Ed
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