Red-green colour blindness in humans is governed by a sex-linked recessive gene. A normal woman whose father was colour blind marries a colour blind man. What proportion of their daughters is expected to be colourblind?

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1/2. The woman must be a carrier because her father was colour blind, so she received his affected X chromosome but is phenotypically normal. A colour-blind father passes his affected X to all daughters, and half of the mother's X gametes carry the recessive allele, so half the daughters are affected.

Red-green colour blindness in humans is governed by a sex-linked recessive gene. A normal woman whose father was colour blind marries a colour blind man. What proportion of their daughters is expected to be colourblind?

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