In humans the sex chromosomes comprise one pair of the total of 23 pairs of chromosomes. Your contribution may be further edited by our staff, and its publication is subject to our final approval. The Western " homosexual " category has been related [ by whom? Dworkin; Sexuality and Society; Quote from the report: Can you get pregnant on the Depo shot? The effects of genes carried only on the Y chromosome are, of course, expressed only in males.