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Sex chromosomes are the genetic elements that define a person's biological sex Females have two x chromosomes in their cells, while males have one x and one y. 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). Humans and most other mammals have two sex chromosomes, x and y, that in combination determine the sex of an individual 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. 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.

Note that there are exceptions in which xy does not produce males and xx does not produce females You can read more about various genetic conditions that can result in such conditions in chapter 8 and here 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 The absence of the y chromosome leads to female development This simple combination plays a significant role in sexual differentiation. A sex chromosome is a type of chromosome involved in sex determination

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