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Learn how sex chromosomes determine biological sex and how they differ from gender identity Explore the history and science of sex chromosomes with examples and illustrations. Find out how x and y chromosomes work, what genes they carry, and what conditions are linked to them.

Learn about the xy system of sex determination, which is used by many mammals, including humans, some insects, plants and fish Learn how the x and y sex chromosomes determine our biological sex and how intersex people differ from typical males and females Find out how the y chromosome and the sry gene influence male development, and how xy sex determination differs from zw and other systems.

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. 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. Learn about the diversity of sex chromosomes and genetic expression beyond xx and xy, and how they affect physical features and gender identity Explore examples of intersex variations, such as klinefelter syndrome, turner syndrome, swyer syndrome and more.

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