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Sex chromosomes are the genetic elements that define a person's biological sex While we’re usually taught that there are two types — xx and xy — many more variations exist. 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). Sex chromosomes are more complex than most people think In humans the sex chromosomes consist of one pair of the total of 23 pairs of chromosomes

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. These include 22 pairs of “autosomes” (which refers to all chromosomes that are not sex chromosomes) and a pair of sex chromosomes, either an x and a y (which makes for a male) or two xs (female) That means the genetic signature for a person with 46 chromosomes is either 46,xy (males), or 46,xx (females).

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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