If a normal visioned man marries a woman whose father was also colourblind, then his wife would be carrier of this disease if her mother was normal. This trait is passed into children but daughters produced by this couple are carrier not the colourblind. 50% of sons would be colourblind.

Question

Accepted Answer

(a) True. Colour blindness is typically X-linked recessive. A woman with a colourblind father and a normal mother is usually a carrier, so with a normal man, half the sons can inherit the affected X and be colourblind, while daughters are generally carriers rather than affected.

If a normal visioned man marries a woman whose father was also colourblind, then his wife would be carrier of this disease if her mother was normal. This trait is passed into children but daughters produced by this couple are carrier not the colourblind. 50% of sons would be colourblind.

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