Colour Blind.

Went out with a bunch of council friends and one of them commented that her teacher said females will not be colour blind, only applied to males.

I went to wikipedia and found out that men are more prone to be colour blind.

According to Wikipedia:

About two percent of females and eight percent of males are color blind (Sewell, 1983).

The reason males are at a greater risk of inheriting an X linked mutation is because males only have one X chromosome (XY), and females have two (XX).

In color blindness caused by mutations on the X chromosome there is a 50% chance of male offspring being affected and a 50% chance of female offspring being carriers. Nature usually deals with mutated genes by expressing the healthy copy in offspring. Males only receive one copy and are therefore more vulnerable to mutations on the X chromosome being passed to them by their mothers. If the X chromosome passed to a male carries a color blindness causing mutation then the male will be color blind because there is no chance of another X chromosome silencing the mutation. If one of the X chromosomes of a female carries the gene for color blindness, generally the other will not, so there is a dominant gene to take the place of the recessive one.

If you want more information, check out http://en.wikipedia.org/wiki/Color_blindness

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