GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Red-green colorblindness is a sex-linked recessive condition in humans. If a woman with colorblindness marries a man who is normal, then what are the chances their daughter will have colorblindness? What about their sons?
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daughters-50%sons-50%
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daughters-100%sons-100%
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daughters-0%sons-100%
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daughters-50%sons-0%
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Explanation:
Detailed explanation-1: -Red-green color blindness is a sex-linked recessive trait in humans The normal; dominant allele is symbolized with XN, and the recessive allele is symbolized with X". Two people with normal color vision have a color-blind son.
Detailed explanation-2: -There is almost certainly a 50% chance that any one of your sons will be affected by red-green colorblindness.
Detailed explanation-3: -Hence, probability of an affected daughter is one out of two or 1/2 or 0.50.
Detailed explanation-4: -Each daughter has a 50% chance for being color blind and a 50% chance for being a carrier.
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