The father and mother are brown-eyed, have normal color vision; their son is blue-eyed color blind
The father and mother are brown-eyed, have normal color vision; their son is blue-eyed color blind. maybe this family will have a daughter with the same de phenotype as a brother?
Gene A is responsible for the dominant color of the parents’ eyes, and for the recessive one. For normal color perception – N, for color blindness – n. The gene for perception is located on the X chromosome. The genotypes of the parents look like this: AaXNXn X AaXNY. The genotype of the son is aaXnY. To give birth to a daughter with the phenotype of a son, she must receive two X chromosomes with n genes in each. The mother can transmit one such chromosome (Xn), but the father cannot, his only chromosome carries the gene for normal perception (XN). Therefore, parents cannot have a blue-eyed daughter of a color blind person. There can only be a blue-eyed carrier of the gene for color blindness.