Learn about the xx and xy chromosomes, the sex determination system, and other chromosome combinations. Xx and xy chromosomes are two types of sex chromosomes that determine the biological sex of an individual in many species, including humans 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).
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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. The typical number of chromosomes in each human cell is 46 These include 22 pairs of “autosomes” (which refers to all chromosomes that are not sex chromosomes) and a pair of sex chromosomes, either an x and a y (which makes for a male) or two xs (female).
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.
