If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ?

1. 100%

2. 25%

3. 50%

4. 75%

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. 100%

Key idea: Colour blindness is X-linked recessive.

The female is colour blind: \(X^cX^c\).
The man's mother was colour blind, so she gave him \(X^c\). He is \(X^cY\) and is colour blind himself.
Cross \(X^cX^c \times X^cY\): all daughters are \(X^cX^c\) and all sons are \(X^cY\).

So 100% of the progeny are colour blind.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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