Question

A sex linked recessive gene 'C' produces red green colour blindness in humans. A normal woman whose father was colourblind marries a colourblind man. Of all the girls born to these parents, what percentage is expected to be colour blind?

• A. 25 percent
• B. 50 percent
• C. 75 percent
• D. 100 percent

Answer 1

The correct option is B 50 percent

A sex linked recessive gene 'C' produces red - green colour blindness in humans. A normal woman whose father was colourblind - XC Xc, marries a colourblind man - Xc Y. Offsprings: XC Xc, Xc Xc (carrier), XC Y and Xc Y (colour blind).