Answer: the correct answer for the blank is- A) either the X or Y chromosome.
Sex linked traits are those characteristics of an individual that are depicted by the genes, which are present on sex chromosome ( present within reproductive cells like sperm and egg).
There are two types of sex chromosomes that is X chromosome ( found in both makes and females ) and Y chromosome ( present only in males).
Thus, traits that are sex-linked are carried on either the X or Y chromosome .