can a color blind female have a son that has normal vision? color blindness is caused by a sex linked recessive allele. N=normal vision n=color blind
Yes, a color blind female can have a son with normal vision. Color blindness is a sex-linked recessive genetic condition, meaning that it is primarily passed down from parents to children through the X chromosome.
To determine the probability of a color blind female having a son with normal vision, we need to understand the genetic inheritance pattern involved. In this case, the color blind female would have two X chromosomes, one of which carries the color blindness gene (n) and the other carries the normal vision gene (N). On the other hand, the father would have one X chromosome (N) and one Y chromosome (which doesn't carry any color vision genes).
Since the mother is color blind, she will pass down one of her X chromosomes to her son. If she passes down the X chromosome with the normal vision gene (N) to her son, he will have normal vision. If she passes down the X chromosome with the color blindness gene (n) to her son, he will be color blind.
The chances of her passing down either X chromosome to her son are as follows:
- There is a 50% chance that her son will receive the X chromosome with the normal vision gene (N).
- There is also a 50% chance that her son will receive the X chromosome with the color blindness gene (n).
Therefore, a color blind mother has a 50% chance of having a son with normal vision, assuming the father does not carry the color blindness gene.