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Note:

To be color blind you need 2 color blind allele. So color blind allele are recessive. In females, color blinds only occur if both of the alleles are recessive.

Cousins are of course biological cousin.

Genetic similarity defined as the partial derivative of expected value of having a color blind allele of a cousin as a function of the percentage of you having color blind allele is 1/8.

I think I should add that color blind alleles are extremely rare. It's actually 5% but you can presume it's .0000001%. However, you, a female, is color blind. What's the chance that your cousin is color blind?

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    More information/clarity is needed to turn this into a mathematics question...2012-06-11
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    You ignore any sex-relatedness of this particular type of color-blindness? (As I recall, the most common red-green color-blindness is on the Y chromosome, so the sex comes into these calculations.)2012-06-11
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    Yea, I'll add that. Color blind people must be male. However, the color blind thingy is in X chromosome. Y chromosome never form allele.2012-06-11
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    You contradicted yourself. Males only have one $X$ chromosome, so they only have one allele for genes on that chromosome. Females with two "color-blind" alleles could be color-blind.2012-06-11
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    Let me check again. Females are rarely color blind.2012-06-11
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    Yap. I think I did that. It's good enough now.2012-06-11

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