A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy

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Correct answer: D. may be colourblind or may be of normal vision

Colourblindness is a sex linked (X-linked) trait. It always transfers from mother to son. A woman, whose father was colourblind, will cross be carrier for colourblind trait. Marriage of this woman with a colourblind man will result of the following possibilities. A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child

A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child

A woman with normal vision, but whose father was colourblind,...

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