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Question: problem 220 galactosemia is a recessive human disease that is...

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Problem 2-20:

Galactosemia is a recessive human disease that is treatable by restricting lactose and glucose in the diet. Susan Smithers and her husband are both heterozygous for the galactosemia gene. If Susan and her husband have four children, what is the probability that: (1 point each)

a. none of the four will have galactosemia?

b. at least one child will have galactosemia?

c. only one child will have galactosemia?

d. the first two will have galactosemia and the second two will not?

e. two will have galactosemia and two will not, regardless of order?

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