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Sex chromosomes are the genetic elements that define a person's biological sex Learn about dsds and intersex variations. Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

Learn how this system works in humans, mammals, insects, plants and other species. Discover how sex chromosomes vary naturally and why biological sex isn't always binary 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

In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes. Cracking the code to sex and genetics Understand how these chromosomes influence your biology and health. This web page explains why humans have two types of sex chromosomes, x and y, and why men do not have yy pairs

It also discusses the genes and functions of x and y chromosomes, and the effects of xyy syndrome. Learn how sex chromosomes affect your sexual anatomy and reproductive development Find out about the different types of sex chromosomes, variations, and intersex conditions. Xx and xy chromosomes are only part of the story

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