3.4 - F - Sex Linked Genes
Sex-linked genes are those that are located on the sex-determining chromosomes of a species (pair 23 for humans). As a result, they affect males and females differently and do not show the same inheritance pattern as autosomal traits (non sex-determining).
Sex-linkage was observed by Thomas Morgan in Drosophila, a fruit fly, most examples are due to genes located on the X chromosome as there are few genes located on the Y chromosome.
Two examples of this include red-green colour-blindness and hemophilia.
Red green colour-blindness is a sex-linked trait