A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents.

Name: A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents.
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A male expresses an X-linked recessive disorder if he inherits the allele conferring the disorder from his mother, as males have only one X chromosome (inherited from their mother) and one Y chromosome (inherited from their father).

A Male Expresses an X-Linked Recessive Disorder Only If He