Assignment task: Color Blindness with a Twist:
Color blindness is caused by a recessive gene on the X chromosome.
Since men have one copy of the X chromosome (they have a Y chromosome in place of another X) and women have two X chromosomes it is only possible for men to have one copy of the gene for color blindness.
Because of this, if a man has the recessive color blind gene, he will be color blind.
A woman can have one recessive color blind gene and one dominant normal vision gene and not be color blind.
If a man donates an X chromosome in his sperm, the child formed when that sperm joins with an egg will be a girl because a woman can only donate an X chromosome in her egg.
On the other hand, if a man donates a Y chromosome in his sperm, the child will be a boy.
Question:
1. Based on the information shown above, explain what happened if a man with normal vision (not color blind) has a wife that is color blind and their daughter is colorblind.
2. What would you do think happen in this case?