Question

A normal woman whose father was colourblind marries a normal man. What kinds of children would be expected and in what proportion?

• A. Daughters normal, 50% of sons colourblind
• B. Daughters normal, all sons colourblind
• C. 50% of daughters colourblind, all sons normal
• D. All daughters colourblind, sons normal

Answer 1

Answer: (A)

Daughters normal, 50% of sons colourblind

Normal woman whose father was colour blind - X Xc
Genotype of normal man - X Y
Offsprings: XX, XY, Xc X, Xc Y