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  4. A colourblind man marries a normal vision woman whose father was colourblind. They have a first child as a son. What are the chances that a child would be colourblind?

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Q. A colourblind man marries a normal vision woman whose father was colourblind. They have a first child as a son. What are the chances that a child would be colourblind?

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

Clour blindness is X linked genetic recessive disorder in which a carrier female passes its X- linked recessive gene to 50% of its male progeny and 50% male progeny are normal.
Solution