Sex chromosomes determine sex identity

NCBI Bookshelf. 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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Gender and Genetics

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“I’m XY and I Know It”: Sex Determination Systems - Science in the News

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. Compared to asexual reproduction, in which cells can simply create carbon copies of themselves, sexual reproduction allows for the introduction of genetic diversity into a population. In most sexually reproducing organisms, there are two sexes — but the ways in which these sexes are determined and the ways in which they manifest vary greatly.
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Sex chromosome

What role do sex chromosomes play in the identities of transgender people? Biological gender and gender identity are two very distinct concepts. Biological sex is purely determined by the choice of sexual differentiation pathway, which is guided by genes on the sex chromosomes though not exclusively, for example: WNT4 on chromosome 1.
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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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