HardBiologyHigh School (11–12)Heredity and Evolution › Principles of Inheritance and VariationNumerical

Red-green colour blindness is X-linked and recessive…

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Red-green colour blindness is X-linked and recessive. In a population in Hardy-Weinberg equilibrium, $10\%$ of the men are colour blind.

What is the frequency $q$ of the colour-blind allele?

What per cent of the women are colour blind?

What per cent of the women are carriers?

What per cent of the women have at least one copy of the allele?

Need a reminder? The key ideaShow

Chi-square is $\sum \dfrac{(O - E)^2}{E}$ , with the classes minus 1 degrees of freedom. A value below the critical value (3.84, 5.99, 7.81 for 1, 2, 3 degrees of freedom) means that the ratio fits. For Hardy-Weinberg, $p + q = 1$ and $p^2 + 2pq + q^2 = 1$ . The affected share is $q^2$ and the carriers are $2pq$ .

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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