Question

Red-green Color Blindness and Hemophilia A are both sex-linked traits in humans. Both genes are on the X-chromosome and are tightly linked. Individual 1 is homozygous normal. Individual 2 is both red-green color blind and a hemophilia. They have 2 daughters (individuals 3 and 4). Individual 6 is the as yet unborn son of 4 and 5.What is the probability that their son, 6, will be both color blind and a hemophiliac? Express your answer as a number between 0.0 and 1.0.