Question

which symbol is used to label a male that expresses a sex - linked disorder on a pedigree? options are represented by a circle, a half - colored circle, a square, a colored square

Explanation:

In pedigree charts, circles represent females and squares represent males. A filled (colored) symbol indicates the individual expresses the disorder. So for a male with a sex - linked disorder, the symbol should be a filled square. The last option (the purple square) fits this description.

Answer:

The purple square (the bottom - most symbol, a filled square)