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Sex chromosomes are the genetic elements that define a person's biological sex Explore examples of intersex variations, such as xxy, xo, cah and ovotestes. Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

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Learn how this system works in humans, mammals, insects, plants and other species. Learn about the diversity of sex chromosomes and how they affect physical features and gender identity Xx and xy chromosomes are only part of the story

Discover how sex chromosomes vary naturally and why biological sex isn't always binary

Learn about dsds and intersex variations. 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.

Learn how the x and y sex chromosomes carry instructions that decide our biological sex Find out how intersex people are born with both masculine and feminine body parts and how they identify. Learn how sex chromosomes affect your sexual anatomy and reproductive development Find out about the different types of sex chromosomes, variations, and intersex conditions.