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Sex chromosomes are the genetic elements that define a person's biological sex Understand how these chromosomes influence your biology and health. Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

In the xx/xy system, karyotypic females usually have two x chromosomes (xx), while karyotypic males usually have a single x and a single y chromosome (xy). Cracking the code to sex and genetics The other 22 pairs of chromosomes are called autosomes

Individuals having two x chromosomes (xx) are female

Individuals having one x chromosome and one y chromosome (xy) are male The x chromosome resembles a large autosomal chromosome with a long and a short arm The y chromosome has one long arm and a very short second arm. The x chromosome is larger than y because it carries more instructions

The x chromosome has some instructions to make body parts that all people have, and others for body parts that only females have A karyotype is a complete set of chromosomes from an organism or species This is a human male karyotype In the red box, you see the sex.