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Sex chromosomes are the genetic elements that define a person's biological sex This simple combination plays a significant role in sexual differentiation. Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female The absence of the y chromosome leads to female development 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.

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). 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 Discover how sex chromosomes vary naturally and why biological sex isn't always binary

Learn about dsds and intersex variations.

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. Sex determination sex determination involves the x and y chromosomes Females have two x chromosomes (xx)

Males have one x and one y chromosome (xy) The presence of the y chromosome triggers male development

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