Question

What combination of alleles best describes a sex linked trait

Answer 1

Alleles that were carried on x and y chromosomes

Answer 2

If im guessing correctly i think your question refers to

which combination of alleles best describes a sex-linked trait?
a. heterozygous alleles
b. homozygous alleles
c. alleles that are acrried on X and Y chromosomes
d. alleles that are carried on somatic cells 
 
i believe its C