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Of both normal parents, the chance of a male child becoming colour blind are

1. no
2. possible only when all the four grand parents had normal vision
3. possible only when father’s mother was colour blind
4. possible only when mother’s father was colour blind

Correct answer: possible only when mother’s father was colour blind

Solution

Colour blindness is typically X-linked recessive. A male child receives his X chromosome from his mother and Y from his father, so the affected X must come through the mother; among the given choices, this is explained by the mother’s father being colour blind, making the mother a carrier.

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