A student in Trinidad observes that red-green colour blindness is much more common in males than females in her community. Which statement best explains this observation?

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Question

A student in Trinidad observes that red-green colour blindness is much more common in males than females in her community. Which statement best explains this observation?

Accepted Answer

Males need only one copy of the recessive allele to be affected — Award 1 mark for understanding hemizygosity in males. A is incorrect — eye strength is unrelated to genetic inheritance. B is incorrect — the allele is on the X chromosome, not Y. D is incorrect — females can inherit the allele and be carriers or affected if homozygous.

Answer

Males need only one copy of the recessive allele to be affected

Answer

Females cannot inherit the colour blindness allele

Answer

The allele for colour blindness is located on the Y chromosome

Answer

Males have weaker eyes than females

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