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# 31 from ADA 2007 sample test.
In human beings, color blindness is controlled by an X-linked recessive allele. In a cross involving this X-linked trait, the male parent has normal color vision, but the female parent is a carrier. What are the chances (in %) that a male offspring will inherit color blindness?
I thought the answer was 50%. b/c female parent is a carrier.. doesn't that mean that the female has 50% of becoming a carrier. The problem didn't specify and say the female is a carrier, and I thought that female has 50% of becoming a carrier, and female (either X^cX or X X ) with male X Y would produce another 50% male inheriting color blindness;thus, 25%?
BTW the answer was 50%... but I thought it was 25%
In human beings, color blindness is controlled by an X-linked recessive allele. In a cross involving this X-linked trait, the male parent has normal color vision, but the female parent is a carrier. What are the chances (in %) that a male offspring will inherit color blindness?
I thought the answer was 50%. b/c female parent is a carrier.. doesn't that mean that the female has 50% of becoming a carrier. The problem didn't specify and say the female is a carrier, and I thought that female has 50% of becoming a carrier, and female (either X^cX or X X ) with male X Y would produce another 50% male inheriting color blindness;thus, 25%?
BTW the answer was 50%... but I thought it was 25%