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"[Tennessee] Senate Bill 1440/House Bill 239, effective since July 1, 2023, establishes sex in all state codes as “a person’s immutable biological sex as determined by anatomy and genetics ..."

You probably saw this earlier news item along the same line, but, to emphasize the idea, Oklahoma did more or less the same thing in early August:

KJRH: "For example, the Order defines 'female' as a person whose biological reproductive system is designed to produce ova. 'Male' is defined as a person whose biological reproductive system is designed to fertilize the ova of a female."

https://www.kjrh.com/news/local-news/gov-stitt-signs-womens-bill-of-rights-through-executive-order

But while both of those Bills are something of a step in the right direction, the fact of the matter is both definitions conflict rather profoundly and quite "problematically" with the standard biological definitions for the sexes. They stipulate that to have a sex is have functional gonads of either of two types, those with neither being sexless:

"Gamete competition, gamete limitation, and the evolution of the two sexes" https://academic.oup.com/molehr/article/20/12/1161/1062990 (see the Glossary)

https://web.archive.org/web/20181020204521/https://en.oxforddictionaries.com/definition/female

https://web.archive.org/web/20190608135422/https://en.oxforddictionaries.com/definition/male

https://twitter.com/pwkilleen/status/1039879009407037441 (Oxford Dictionary of Biology)

Hardly "immutable". Technically speaking, none of us acquire a sex until the onset of puberty and can lose our "membership cards" in those sex categories thereafter. Interesting article in Wiley Online Library that emphasizes the point:

Wiley: "Another reason for the wide-spread misconception about the biological sex is the notion that it is a condition, while in reality it may be a life-history stage. For instance, a mammalian embryo with heterozygous sex chromosomes (XY-setup) is not reproductively competent, as it does not produce gametes of any size. Thus, strictly speaking it does not have any biological sex, yet."

https://onlinelibrary.wiley.com/doi/epdf/10.1002/bies.202200173

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