Color Blind question

[bluesdeluxe]

If 1/12 of the males in a population are red-green colorblind, what fraction of females from that population are red-green colorblind?

a)1/6
b) 1/12
C) 1/48
d) 1/144
e) no females will have the trait cause rg colorblindness is on a sex chromosome


the sample test I took with this question had another red-green colorblindness question in the science part and it was a sex linked cell. Seems to me any female who inherited the gene would have another X chromosome that is dominant therefore they would be carries and never be colorblind. The answer guide says it's D cause of 1/12 times 1/12 or something. Is the answer wrong?

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[keibee82]

If 1/12 of the males in a population are red-green colorblind, what fraction of females from that population are red-green colorblind?

a)1/6
b) 1/12
C) 1/48
d) 1/144
e) no females will have the trait cause rg colorblindness is on a sex chromosome


the sample test I took with this question had another red-green colorblindness question in the science part and it was a sex linked cell. Seems to me any female who inherited the gene would have another X chromosome that is dominant therefore they would be carries and never be colorblind. The answer guide says it's D cause of 1/12 times 1/12 or something. Is the answer wrong?

yes it is D. Since rg colorblindness trait is recessive females need both
recessive traits to be rg colorblind. Therefore 1/12 X 1/12 = 1/144