Question

What are all the chances of colour blind daughter and sons being born in a marriage of normal man marrying a normal woman, whose father was colour blind?

• A. All sons are normal and all daughters are colourblind.
• B. Both the sons and daughters are colourblind.
• C. All the sons are colourblind and all daughters are normal.
• D. 50% sons are colourblind and all daughters are phenotypically normal.

Answer 1

The correct option is D 50% sons are colourblind and all daughters are phenotypically normal.

Normal man - XC Y
Normal woman whose father is colour blind - XC Xc
Offsprings: XC XC (Normal), XC Xc (Normal), XC Y (Normal) and Xc Y (Colour blind)