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Sex chromosomes are the genetic elements that define a person's biological sex Learn about dsds and intersex variations. 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). Discover how sex chromosomes vary naturally and why biological sex isn't always binary 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. 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. Xx and xy chromosomes are only part of the story

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