A man, J.B., has a sister with autosomal recessive galactosemia (OMIM 230400), a

Question

A man, J.B., has a sister with autosomal recessive galactosemia (OMIM 230400), and his partner, S.B., has a brother with galactosemia. Galactosemia is a serious condition caused by an enzyme deficiency that prevents the metabolism of the sugar galactose. Neither J.B. nor S.B. has galactosemia, but they are concerned about the risk that a future child of theirs will have the condition.

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(1/4 is wrong)

A man, J.B., has a sister with autosomal recessive galactosemia (OMIM 230400), and his partner, S.B., has a brother with galactosemia. Galactosemia is a serious condition caused by an enzyme deficiency that prevents the metabolism of the sugar galactose. Neither J.B. nor S.B. has galactosemia, but they are concerned about the risk that a future child of theirs will have the condition. Part A What is the probability their first child will have galactosemia? Submit Previous Answers Request Answer UI

Explanation / Answer

1/4 will be the correct answer.In case both the parents are carrier there will be 1/4 affeced and 1/4 unaffected and 50% will be the carrier.

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