In man, two abnormal conditions, cataracts (C) in the eyes and excessive fragility (F) in the bones, seem to depend on separate dominant alleles located on different chromosomes. Normal vision and normal bones are recessive traits. A man with cataracts and normal bones, whose father had normal eyes, married a woman free from cataracts but with fragile bones. Her father had normal bones. What is the genotype of the man with cataracts and normal bones?
What is the genotype of the woman with normal vision and fragile bones? What type of offspring might this couple expect?

What is the probability that their first child will:
(a) be free from both abnormalities?
(b) have cataracts but not fragile bones?
(c) have fragile bones but not cataracts?
(d) have both cataracts and fragile bones?