Final answer:
In a pedigree, a male expressing a sex-linked disorder is represented by a square symbol.
Explanation:
In a pedigree, the symbol used to label a male expressing a sex-linked disorder is a square. Sex-linked disorders, such as X-linked diseases, affect males more than females due to the inheritance pattern of these genes on the X chromosome.
Learn more about Pedigree symbols for genetic inheritance here:
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