Question

What are sex-linked traits? Give one example of a sex-linked trait. Why are they more likely to be expressed in males than in females?

Answer 1

Sex-linked traits are traits that are determined by genes on the sex chromosomes.

Hemophilia is one example.

Most sex-linked traits are carried on the x-chromosome. Females have two x-chromosomes so are more likely to carry an allele that is dominant over that trait. Males only have one x-chromosome so have to show whatever trait the allele on that chromosome calls for.