Find out the differences between xx and xy chromosomes, and how they relate to gender identity and sexual orientation. It is often assumed that women have xx chromosomes and men have xy, but biology is more complex Some women have xy chromosomes — a natural variation in sex development. Learn how sex chromosomes determine the sex of humans and other organisms, and why men cannot have yy pairs Find out the important genes on x chromosome and the consequences of xyy syndrome. Learn how the xy system determines the sex of many mammals, including humans, based on the presence or absence of the y chromosome
Delve into the genetics of biological sex Learn why women typically have two x chromosomes and discover the fascinating exceptions. Sex chromosomes are more complex than most people think While we’re usually taught that there are two types — xx and xy — many more variations exist. Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female The sex chromosomes of human beings and other mammals are designated by scientists as x and y
