A Married Couple Comes to the Physician for Routine Prenatal

A married couple comes to the physician for routine prenatal counseling.  The husband is 120 cm (3 ft 11 in) tall with disproportionately short upper and lower extremities, a large head, and a prominent forehead.  He is unable to provide a biological family history as he was adopted.  His spouse is of average height with normal constitutional features, and her family history is insignificant.  They are concerned about their unborn child's height.  Which of the following is the best response to their concerns?

A) The condition is not inheritable
B) The risk depends on the child's biological sex
C) The risk depends on the mother's carrier status
D) The risk for the child to be short is about 25%
E) The risk for the child to be short is about 50%

Correct Answer:

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