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If their dad gives them an x chromosome, they’ll be xx, or biologically female This binary classification has long shaped our understanding of gender and biological sex. If their dad gives them a y chromosome, they’ll be xy, or biologically male.
Portrait of a happy group of women standing together in a studio. Women of different ages
It is often assumed that women have xx chromosomes and men have xy, but biology is more complex Traditionally, females have two x chromosomes (xx), while males have one x and one y chromosome (xy) Some women have xy chromosomes — a natural variation in sex development
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They grow up identifying and living as women, and most only discover well into puberty that they are different.
The egg always carries an x chromosome, but the sperm can carry either an x or a y chromosome If the sperm that fertilises the egg carries an x, the baby will have two x chromosomes (xx), typically developing as female. 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. Women have 22 normal chromosomes and 2 x chromosomes, ie 22 + xx, and men have 22 normal chromosomes and 1 x, 1 y, ie 22 + xy.
