Yes, males and females (XY and XX) account for the vast majority of the human species. Some syndromes that cause variations (intersex, XXY, XYY, etc.) are a ver

Yes, males and females (XY and XX) account for the vast majority of the human species. Some syndromes that cause variations (intersex, XXY, XYY, etc.) are a very small minority, and people with those conditions usually have some health issues to deal with.