Sex chromosomes determine sex identity

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 comprise one pair of the total of 23 pairs of chromosomes. The other 22 pairs of chromosomes are called autosomes. The X chromosome resembles a large autosomal chromosome with a long and a short arm. The Y chromosome has one long arm and a very short second arm.
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“I’m XY and I Know It”: Sex Determination Systems 101

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Chromosomes: Definition & Structure | Live Science

When the International Astronomical Union IAU reclassified Pluto from planet to dwarf planet in , it did nothing to change the fact of the existence of Pluto. The scientific process often involves tweaking taxonomies. Over time we added extra things, like asteroids rocky and comets icy , to cover new discoveries — and, then, even further research and pictures like those returned by the Rosetta probe meant that some of the things we thought made asteroids and comets very different were really only a reflection of our perspective. This too will pass, probably.
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What Role Do Sex Chromosomes Play In Transgender People's Identities?

Not intercourse, though — more about how genetic sex is programmed during development. Sexual identity has been in the news often lately, and unsurprisingly so: the past few years have yielded sweeping reforms in civil rights, spurring new conflicts surrounding everything from age-old battles in gender equality to legislation enforcing anti-transgender bathrooms. Most multicellular organisms, humans included, use sexual reproduction to reproduce.
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Humans are born with 46 chromosomes in 23 pairs. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome 45X or 45Y sex monosomies and some with three or more sex chromosomes 47XXX, 47XYY or 47XXY, etc. In addition, some males are born 46XX due to the translocation of a tiny section of the sex determining region of the Y chromosome.
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