this post was submitted on 14 Mar 2025
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Science Memes

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[–] alykanas@slrpnk.net 20 points 1 day ago* (last edited 1 day ago) (11 children)

How do you know if someone has a PhD.?

They tell you

Never not true

[–] Franklin@lemmy.ca 30 points 1 day ago

True, but I do think it was warranted in this case.

[–] dQw4w9WgXcQ@lemm.ee 25 points 1 day ago

This is putting confirmation bias to the extreme.

[–] drtaco@lemmy.dbzer0.com 12 points 1 day ago (2 children)

Sometimes they don't tell you and just quietly update all of their usernames...

[–] Doctor_Satan@lemmy.world 5 points 1 day ago

Right? It's really weird...

[–] xthexder@l.sw0.com 6 points 1 day ago (1 children)

Do you by chance have a PhD in food science?

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[–] TwistyLex@discuss.tchncs.de 5 points 1 day ago

Funny enough, my boss has a PhD in Evolutionary Biology. She never tells people because they start referring to her as Doctor, and she hates that. I don't think I've actually ever heard her bring it up on her own.

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[–] rambling_lunatic@sh.itjust.works 15 points 1 day ago (7 children)

I'm a bit uninformed on this; it seems fascinating. Do these things happen due to something unusual during the growth of a fetus? What's the name for this phenomenon?

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[–] OsrsNeedsF2P@lemmy.ml 25 points 1 day ago (17 children)

Can someone explain to me how some XX people become cis male?

[–] ragebutt@lemmy.dbzer0.com 41 points 1 day ago

De La Chappell syndrome, congenital adrenal hyperplasia, androgen exposure in utero, ovotesticular disorder of of sex development all result in a person with cis male characteristics and in some cases cis male typical genitalia despite having xx chromosomes

[–] forrgott@lemm.ee 40 points 1 day ago

Gene expression is not as straightforward as people think. All sorts of weird shit can happen, and that's not even including gene mutations.

[–] evasive_chimpanzee@lemmy.world 26 points 1 day ago* (last edited 1 day ago) (1 children)

https://static.scientificamerican.com/sciam/assets/File/Pitch_sketch_final.png?w=2000

This is the best resource I've seen to show things relatively simply.

The TL;DR is that a whole "Y" chromosome isn't exactly responsible for "maleness", the SRY gene is. It's normally on the Y chromosome, but mutations can occur placing that gene onto the X chromosome. Inversely, someone could inherit a Y chromosome without that gene, in which case they would develop with female traits.

It's not considered trans because someone with 46XX plus the SRY gene would develop male genitalia, be identified as male at birth, and likely identify themselves as male. For some types of these conditions, there are plenty of people walking around with no clue that their chromosomes don't match their gender.

Disclaimer: I'm not a geneticist, so i could have explained something a little off.

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[–] OmnipotentEntity@beehaw.org 22 points 1 day ago* (last edited 1 day ago)

I googled it for you.

https://en.wikipedia.org/wiki/XX_male_syndrome

In 90 percent of these individuals, the syndrome is caused by the Y chromosome's SRY gene, which triggers male reproductive development, being atypically included in the crossing over of genetic information that takes place between the pseudoautosomal regions of the X and Y chromosomes during meiosis in the father.[2][7] When the X with the SRY gene combines with a normal X from the mother during fertilization, the result is an XX genetic male. Less common are SRY-negative individuals, those who are genetically females, which can be caused by a mutation in an autosomal or X chromosomal gene.[2] The masculinization of XX males is variable.

[–] Didros@beehaw.org 18 points 1 day ago

You've heard of xy people and xx people, but wait till you hear about X people!

Or xxx people, or xxy people, or... dies

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[–] 4oreman@lemy.lol 19 points 1 day ago (7 children)
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