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(A) In $X$-linked recessive inheritance,the mother acts as a carrier (heterozygous,$X^CX^c$) because she has one normal allele and one mutant allele.

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$X$-linked recessive disease

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(A) In $X$-linked recessive inheritance,the mother acts as a carrier (heterozygous,$X^CX^c$) because she has one normal allele and one mutant allele. When she passes the $X$ chromosome carrying the mutant allele to her sons,they will express the disease because they only have one $X$ chromosome $(XY)$. Therefore,$X$-linked recessive traits are characteristically transmitted from carrier mothers to approximately $50\%$ of their sons.

This type of disease is transmitted from a carrier mother to some of her sons.

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