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If a colour blind woman marries a normal visioned man, their sons will be:

1. one-half colour blind and one-half normal
2. three-fourths colour blind and one-fourth normal
3. all colour blind
4. all normal visioned

Correct answer: all colour blind

Solution

Colour blindness is typically an X-linked recessive trait. A colour blind woman must pass her affected X chromosome to every son, while the father contributes a Y chromosome, so all sons express colour blindness.

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