The deficiency of the enzyme glucose-6-phosphate dehydrogenase (G6PD) is inherited as a recessive gene on the X chromosome in humans. A phenotypically normal woman (whose father had G6PD) is married to a normal man. What fraction of their sons would be expected to have G6PD?
A) 1/4
B) zero
C) 1/2
D) 100%
E) 1/3
Answer: C
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____.
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