A normal woman with a color-blind brother:
A) is herself heterozygous for the gene causing color blindness.
B) has a 50% chance of being heterozygous for the gene causing color blindness.
C) has a 25% chance of being heterozygous for the gene causing color blindness.
D) has a 10% chance of being heterozygous for the gene causing color blindness.
E) cannot carry the gene causing color blindness.
Correct Answer:
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