Recessive characters are expressed:

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(A) Recessive alleles are those that only express their phenotype when present in a homozygous condition. In the case of $X$-linked recessive traits,m

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Only when they are present on $X$ chromosomes of male

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(A) Recessive alleles are those that only express their phenotype when present in a homozygous condition. In the case of $X$-linked recessive traits,males are hemizygous (having only one $X$ chromosome). Therefore,if a recessive allele is present on the single $X$ chromosome of a male,it will be expressed because there is no dominant allele on a second $X$ chromosome to mask its effect. Thus,the correct condition for the expression of $X$-linked recessive characters in males is their presence on the $X$ chromosome.

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