In humans, the gene for brown eyes dominates over blue eyes (A), and the gene for color blindness is recessive

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

Given: A – brown, a – blue, XD – norm, Xd – color blindness.
Solution: R: AaHDxd x aaHDY
G: (AXD) (AXd) (aXD) (aXd); (aXD) (aY)
F1: AaHDXD (girl, brown-eyed, healthy) AaXDXd (girl, blue-eyed, healthy) aaXDXD (blue-eyed healthy) aaXDXd (girl, blue-eyed, healthy) AaXDY (boy, brown-eyed, healthy) AaXdY (boy, brown-eyed, sick) , blue-eyed, healthy) aaXdY (boy, blue-eyed, sick).
Answer: the probability of birth: color blindness 25%, brown-eyed child 50%, girl 50% and boy 50%.