Sex chromosomes decide whether you’re biologically male (xy) or female (xx), but they don’t define your gender. 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). 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.
If the sperm that fertilises the egg carries an x, the baby will have two x chromosomes (xx), typically developing as female If the sperm carries a y, the baby will have one x and one y chromosome (xy), typically developing as male. People usually have two sex chromosomes Typically, embryos with one x and one y chromosome develop into males And those with two x chromosomes usually become females We get one sex chromosome from our fathers, carried by sperm, and one from our mothers, carried by the egg.
People with an sca may have one x chromosome, xxy. However, there is one exceptional set of chromosomes The “sex chromosomes” (or pair 23 See “understanding homology in humans”) These are known in humans as the x and y chromosomes, because of their appearance Generally, female humans have two pairs of x chromosomes.
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