Sex chromosomes are the genetic elements that define a person's biological sex. Learn about the XX and XY chromosomes, the sex determination system, and other chromosome combinations.

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May 6, 2025 · 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.

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Dec 14, 2023 · 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.

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