Why is the frequency of red-green colourblindness is many times higher in males than that in the females?

Explanation

Colourbilindenss is a X-linked sex inheritance. For becomong colourblind, the femele must have the allele for it in both her X-chromolsomes nd if only one X-chromosome of female possess allele for colur blind character she becomes the carrier for this characteristics But males develop colourbindness when their sole X-chromosome has the allele for it. Thus males are more prone to colour blindness while femeles arr carries.