Concept:Sex-linked traits are controlled by genes carried on the sex chromosomes, especially the X chromosome.
Explanation:Sex-linked traits are determined by genes found on the sex chromosomes (
X and
Y).
In humans, most sex-linked genes are on the
X chromosome and are called
X-linked.
A son can inherit an
X-linked allele from his mother, while a daughter can inherit one from either parent.
Because males have only one
X chromosome, recessive
X-linked traits appear more often in males.
Female carriers usually show the trait only when both
X chromosomes carry the allele.
Hormonal factors do not determine whether a trait is sex-linked; the location of the gene is what matters.
Therefore, the correct statement is that sex-linked traits are located on the sex chromosomes.
Answer:A. Sex-linked traits are located on the sex chromosomes.