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In this system, the karyotypic sex of an individual is usually determined by a pair of sex chromosomes While we're usually taught that there are two types — xx and xy — many more variations exist. Typically, karyotypic females have two of the same kind of sex chromosome (xx), and are called.

Sex chromosomes are the genetic elements that define a person's biological sex Sex chromosomes are more complex than most people think Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations.

The female has two x chromosomes, and all female egg cells normally carry a single x.

The two primary types of sex chromosomes are x and y Typically, females possess two x chromosomes (xx), while males carry one x and one y chromosome (xy) 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. It is often assumed that women have xx chromosomes and men have xy, but biology is more complex Some women have xy chromosomes — a natural variation in sex development They grow up identifying and living as women, and most only discover well into puberty that they are different.

Without an sry, an embryo will develop as a female instead of as a male whether it has a y chromosome or not

Beyond the binary there are more than just two possible sexes for which the chromosomes can carry instructions While most people are typical xy males or xx females, many people are intersex. On the left are factors that influence sex differentiation Next to that is 46xx, meaning a person with 46 chromosomes of which two are xx

These individuals would develop as female On the far right is 46xy, a person with 46 chromosomes of which two are xy These individuals would develop as male. Primary and secondary sex determination primary sex determination is the determination of the gonads

In mammals, primary sex determination is strictly chromosomal and is not usually influenced by the environment

In most cases, the female is xx and the male is xy Every individual must have at least one x chromosome Since the female is xx, each of her eggs has a single x chromosome

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