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Sex chromosomes are the genetic elements that define a person's biological sex This means that if a gene on a sex chromosome is defective or different, males have no second copy to. 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). But for males, there is no second copy of genes on the singular x chromosome or the singular y chromosome 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. 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. 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. 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. Recall that for most genes everyone has two copies—one on each chromosome

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