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Galactosemia is a recessive human disease that is treatable by restricting lactose and glucose in the...

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 the couple has four children with galactosemia, what is the probability that their next child will have galactosemia?

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Solution:

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 the couple has four children with galactosemia,

then the probability that their next child will have galactosemia is given by,

Probability of having an affected child is 1/4 .

Since the genotype of one child is independent of others.

Therefore the probability that their next child will have galactosemia is 1/4.

Please rating the answer. Thank you!

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