Biology for IGCSE & O level - Inheritance (Section 11 - No. 49)
If a woman is colorblind and her partner has normal vision, what is the probability of their son being colorblind (assuming colorblindness is X-linked recessive)?
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คำอธิบาย
Since the mother is colorblind, she has two recessive alleles. The son will always receive one X chromosome from the mother; therefore, he will always be colorblind.