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Why are there more colorblind males than there are colorblind females?
Wiki User
∙ 14y ago
Colorblindness is a trait that is linked to our X chromosome - it's a sex-linked, recessive trait that is attached to the X chromosome.
For males, the 23rd pair is XY, and for females, XX.
The trait for colorblindness lies on the X chromosome and can either be dominant or recessive. (For my example, we'll just say X' for recessive and X dominant for simplicity's sake.)
Females have the advantage of having two X chromosomes. I won't go in to specific detail, but the possible combinations of chromosomes for females would be XX, X'X, XX', and X'X'. Only with X'X', would a female be colorblind.
As for males, they only have one X chromosome, and the combinations are XY or X'Y.
As you can see, the chances of colorblind males are much, much higher due to having only one X-chromosome, which is why you'll find more colorblind males than colorblind females.
Of course, there is much more to it than just that, but that goes way beyond the scope of what I can remember. And I'm not too much in the mood of reopening my genetics textbook. ;)
Wiki User
∙ 14y ago
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