One form of red green color blindness is caused by a recessive allele of a gene on the X chromosome. A woman who
is heterozygous for the red green color blindness allele and a man who is red green color blind are starting a family. What is the probability that their children will be red green color blind?
A. 50% for the sons; Zero for the daughters
B. 100% for the sons; 50% for the daughters
C. 100% for the sons; Zero for the daughters
D. 50% for the sons; 50% for the daughters
E. 100% for both sons and daughters