In thinking this is right... (trans / biology question)

[RandomRobot1]

When a trans person goes through the full sex change operation and is officially by law the opposite gender...

If their body was dug up in 1000 years and it was impossible to see the gender then it would be tested and biology would show the body as the original gender they were born with?

Aibu that this is true?
My friend and I were having a discussion on it and I guess were not as informed about biology as we need to be to decide on an answer.

Yes, obviously. You can't change your biological sex.

I doubt there will be scientific advancements enough that excavators can judge a skeletons personal feelings towards which of the 71 gender identities there are

You can generally sex a skeleton by the shape of the hips and the skull. But remember for biologists sex is purely morphological (i.e. based on shapes). The male is the one with the bit the sticks out and the female the one with the bit that goes in, even if the bit that sticks out is connected to eggs and an ovispostor. It's really just a convention so we can classify the whole diversity of the animal kingdom as 'male' and 'female'.

Gender identity is a feeling. In 1000 years the sex of your skeleton would be discernible but your various identities are obviously not. Archaeologists might be able to spot if you'd had any surgery that impacted on bones (like male facial feminisation), and then hazard a guess about what that meant, but couldn't be certain that it definitely meant that you identified as the opposite sex.

If you remember that gender is a social construct, an idea, and it changes over time and that sex is the physical embodiment of male/female it will become plain!

Changing soft tissues will not change bone structure or DNA.

There isn't a 'full sex change operation' there are various operations available if desired and none of them are required for legal recognition. There are no surgeries or legal definitions which change a person's overall bone structure or DNA.

Human males and females are distinguished by their chromosomal makeup. The presence of a Y chromosome indicates maleness. Not sure what ReliefOfChaos is on about.

Yes.
But presumably a future archaeologist would be able to tell if certain surgeries had been performed (e.g. cosmetic procedures to change facial bones). There may also be some evidence of hormones taken, perhaps? I

Skeletons reveal no info about the gender of the deceased.

ReliefOfChaos but what about seahorses? The male is the one who produces the sperm, and the female is the one who produces eggs. The eggs are deposited into the sperm producer, who later gives birth, but the sperm producer is still male.

A human is not a seahorse.

We are human, not sea horses.

DNA would show the original sex they were born with, whether they had XX or XY chromosomes.

I know a human being is not a seahorse! I brought it up in response to a PP's claim that biologists determine sex in the animal kingdom according to "sticky out bits" regardless of eggs and ovipositors.

I’m hoping if they dig me up they’ll be able to see I’m the 5 ft 7 fitness model with lots of money and I fantastic charm and wit about me I identify as. Sadly they’ll probably ignore my feeling and think she was rather short, probably carried a bit of extra weight too🙂

It would be possible to determine the biological sex of a skeleton, but not gender (because sex and gender aren't the same thing and don't always correspond).