Please explain how to figure out the following probability: Genes for color blindness and hemophilia are linked on the X-chromosome in humans with a recombination frequency of 30 %. A woman whose father was a color blind hemophiliac and mother was normal with no history of color blindness and hemophilia wants to have children. The prospective father is normal with no history of either color blindness or hemophilia in his family. What is the probability that she will have a normal child?
(1) 0.70
(2) 0.675
(3) 0.50
(4) 0.35
(5) 0.30
(6) 0.15