The probability that a boy whose mother is heterozygous for an X-linked trait inherits the recessive allele is

Question

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Since the mother is heterozygous for an X-linked trait, she has one dominant and one recessive allele. A son inherits one X chromosome from his mother and one Y chromosome from his father. Therefore, there is a 1/2 chance that he will inherit the recessive allele from his mother.

The Probability That a Boy Whose Mother Is Heterozygous for an X-Linked