Q. What are all the chances of colourblind daughters of a normal man marrying normal women whose father was colourblind?
A) All sons are normal and all daughters are colourblind
B) Both the sons and daughters are phenotypically normal
C) All the sons are colourblind and all daughters are normal
D) 50% sons are colourblind and all daughters are phenotypically normal
Explanation
When a normal man marries a normal woman, whose father was colourblind then their 50% sons are colourblind (50% sons normal) and all the daughters are phenotypically normal(carrier woman also are phenotypically normal). The female parent is carrier as it receives a defective X-chromosome from her father.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.