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

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

NEETNEET 2022Principles of Inheritance and Variation

Solution:

Mother - Colourblind $\left(X^C X^C\right)$ Father - Colourblind $\left(X^C Y\right.$ ) (A male progeny receives $X$ chromosome from the mother. Since mother is colourblind, son is also colourblind). $X^C X^C-X^C X^C-X^C Y-X^C Y-F 1$ Generation $100 \%$ progeny will be colour blind.