In humans, the brown eye gene dominates the blue eye color (A), and the color blind gene is recessive

In humans, the brown eye gene dominates the blue eye color (A), and the color blind gene is recessive (color blind – d) and linked to the X chromosome. A brown-eyed woman with normal eyesight, whose father had blue eyes and suffered from color blindness, marries a blue-eyed man with normal eyesight. Make a scheme for solving the problem. Determine the genotypes of parents and possible offspring, the likelihood of birth in this family of children – color blind with brown eyes and their gender.

1) the mother genotype is AaXDXd (gametes: AXD, aXD, AXd, aXd), the father’s genotype is aaXDY (gametes: aXD, aY);
2) genotypes of children: girls – AaXDXD, aaXDXD, AaXDXd, aaXDXd, boys – AaXDY, aaXDY, AaXdY, aaXdY;
3) the probability of giving birth to color blind children with brown eyes: 12.5% of AaXdY are boys.