Sex-linked gene? Y-linked genes? X-Linked genes?

- A gene that is located on either sex chromosome is called a sex-linked gene​ - Genes on the Y chromosome are called Y-linked genes​ - Many Y-linked genes are related to sex determination​ - Only 78 genes, coding for about 25 proteins, have been identified on the human Y chromosome​ - Genes on the X chromosome are called X-linked genes; the human X chromosome contains about 1,100 genes​ - X chromosomes have genes for many characters unrelated to sex