Color blindness is a recessive trait linked to the X chromosome. In a family where the mother has a normal color sensation

Color blindness is a recessive trait linked to the X chromosome. In a family where the mother has a normal color sensation, a color blind daughter was born. Set the genotypes of the parents. What is the probability of having a healthy son?

We introduce the notation of genes:
A – normal color perception (norm);
and – color blindness.
– Determine the genotypes of the parents. A color blind daughter, her genotype XaXa, was born in this family. It is known that a child inherits one of the allelic genes from the mother, and the other from the father. Therefore, the genotype of a mother with normal color sensation is XAXa, i.e. she is a carrier of color blindness. The father’s genotype is XaY, he is color blind.
Thus, the probability of having a healthy son in this family is 25%.
Answer: the probability of having a healthy son is 25%.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.