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.


B

Biology & Microbiology

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