If a women is color blind, what is the probability that her second son with a...

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If a women is color blind, what is the probability that her second son with a...

If a women is color blind, what is the probability that her second son with a normal-sighted man will be color blind?

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Answer 1

Answer #1

If X^c is the recessive allele causing colorblindness and X⁺ is the normal dominant allele then females having X^cX^c are colorblind whereas the one having X⁺X⁺ or X⁺X^c have normal vision. For male X^cY genotype leads colorblindness.

colorblind female ( X^cX^c ) X normal-sighted man (X⁺Y)

the punnet square gives

	X^c	X^c
X⁺	X^cX⁺	X^cX⁺
Y	X^cY	X^cY

All the sons will have X^cY genotype, therefore, the probability of the son to have colorblindness is 100%

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Answer 2

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