Which combination of alleles best describes a sex-linked trait?
a. heterozygous alleles
b. homozygous alleles
c. alleles that are carried on x and y chromosomes
d. alleles that are carried on somatic cells

The correct answer would be c. alleles that are carried on X and Y chromosomes.

In humans, genomic content is composed of 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.

Sex chromosomes are of two types X and Y.

Females are homozygous (XX) and males are hetrozygous (XY).

Mother can pass her X chromosome randomly to son and daughter however, father will always pass his X chromosome to his daughters and Y chromosomes to his sons.

Hence, the alleles or genes located on the X and Y chromosomes are inherited in a sex-linked fashion.

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