AP BIOLOGY

Detailed explanation-1: -This is why he is most likely color blind. Each daughter has a 50% chance of being a carrier and each son has a 50% chance of being color blind. The daughters who are carriers can have color blind sons with the same logic.

Detailed explanation-2: -There is almost certainly a 50% chance that any one of your sons will be affected by red-green colorblindness. But this doesn’t mean that if you have four sons, two will be colorblind. This is just the most likely result. All or none of your sons being colorblind is possible too.

Detailed explanation-3: -Answer and Explanation: 2. The son receives the X chromosome with red-green color-blindness from his mother and the Y chromosome from his father. In this case, the son has a 50% chance of having red-green color-blindness.

Detailed explanation-4: -If the mother carries the gene but is not color blind, there is a 50% chance that her sons will be color blind and a 50% chance that her daughters will carry the gene. When a color blind father and a mother who carries the color blind gene have children, there is a 50% chance that their sons will be color blind.