A Couple Has Three Offspring: One Child with an Autosomal

question 8

Multiple Choice

A couple has three offspring: one child with an autosomal dominant disease trait and two who are normal.The father is affected by the autosomal dominant disease,but the mother does not have the disease gene.What is the recurrence risk of this autosomal dominant disease for their next child?

• A) 50%
• B) 33%
• C) 25%
• D) Impossible to determine

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