A 25-year-old man with short limbs has achondroplasia. No one in his family has had the disease. He married a woman of normal height and wanted to know their chances of having a child with the same disease. As a consultant you say that
A. 75% of their children will be affected
B. in every pregnancy the chances are 50% that a child will be affected
C. the father has a spontaneous mutation that is not transmitted to his progeny
D. 25% of all of their children will be affected
E. only boys will be affected
C
Achondroplasia is an autosomal dominant disease and is thus passed on to approximately 50% of all children.
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