Why is the frequency of red-green colour blindness is many timeshigherin males than that in the females?

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2 Answers

For becoming colour blind, females must have allele for it in both her X chromosomes. But males develop colour blindness when their sole X chromosome has the allele for it.

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For becoming colourblind, the female must have the allele for it in both her X-chromosomes; but males develop colourblindness when their solex-chromosome has the allele for it.

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