Answer:
black solid colored square box
Explanation:
A sex-linked disorder of male on a pedigree is expressed by a black solid colored square box.
While a male that is just the carrier of sex-linked disorder is represented by by a square box whose half part is solid black in color while the other part is colorless.
A colorless square box in a pedigree signifies a male that is neither affected by any trait associated with sex linked disorder nor even is a carrier of any trait/disorder.
