Discussion
Consider the following statements about the inheritance of colour vision deficiency.
1. Red green deficiency is inherited on the X chromosome.
2. It is therefore far commoner in men than in women.
3. Blue yellow deficiency is also carried on the X chromosome.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 go together: the L and M opsin genes are X-linked, so a man with one defective copy is affected while a woman needs two. Statement 3 is wrong - the S cone opsin gene lies on chromosome 7, so blue yellow deficiency is autosomal, rare, and affects the sexes equally.
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