to point out that one Y chromosome does not make you a male

[Nimbostratus100]

In response to other posts insisting that one genetic test and one Y chromosome makes an athlete indisputably male with no room for error, I just want to point out that it not true.

There is always genetic exchange, for example, between a mother and baby, so anyone who has had a son will still have Y chromosomes in some cells in their body, and that will possibly show up in a genetic screening.

I am all for keeping men out of women's sport, and defining them genetically, but please lets not go over the top - one test does not prove you are male

I wonder how people get through life if they see ‘crack on’ and just generally being disagreed with as being aggressive.

But it’s not like people are walking round unaware of having DSD as TRAs would have us believe.

Some people live a very rich fantasy life so don't engage much in the real world

Don't forget to go visiting your neighbours gardens. Have a great day. Meow.

Yep we all understand the “I’m a scientist” foot stomping counts for did all when it comes to reality😂.

you realise that just because someone disagrees with you it doesn’t make them aggressive.

most are just laughing because you are missing the blindingly obvious. Why would anyone in their right mind think someone who has been pregnant and given birth is a man. TBH at this point there’s nothing to do but laugh

This thread was resolved on the first page by SNWannabe:

Ummm, if you've carried and birthed a baby boy...I would say that has cleared up any question of "are you male or female?" anyway...surely? I am not a geneticist though.

I don’t think science is the problem here.

I am another geneticist, and I can confirm the OP is not one. Perhaps a student who happened to read the research articles about residual fetal cells in mothers and got all excited about it, but definitely not a geneticist, because the OP very obviously, and embarrassingly, lacks any deeper knowledge in genetics that would easily allow her(?) to put that article in context.

OP, please stop embarrassing yourself.

Residual fetal cells in mothers are few and far between. They would not come up in a genetic test. They would not invade other tissues and start replicating.

Cells in a cheek have been formed and differentiated many years before that person becomes a mother. The great majority of cells in an adult body have gone through a process of differentiation and barely replicate anymore, unless it is for repairing an injury. So no, a residual fetal cell won't form a "chunk" of cells inside a person's cheek to the point that a cheek swab would show fetal cells. if that happened, then the problem would not only be Y chromosomes appearing... if the woman had a baby girl instead of a boy, then the genetic test could show a completely different person whatsoever. No, it doesn't happen..

A hand touching a door know does not leave "cells" behind unless it's covered in bodily fluids or has an open wound. Forensic science would look for fingerprints on the door, not "cells".

You're as much a geneticist as I am King Charles.

No, but they do use it to enter female sports categories and beat women...that's the issue under discussion isn't it?

Very true..... only very minor point is that nucleoted blood cells can occaisionally become incorporated and functioning bone marrow. As you say....makes no difference if the baby is make or female. I have similar post above.....former colleague used to go on about this all the time!

A very fair point!

.....very rare but it can happen in complete androgen sensitivity. Biological male fetus with total inability to respond to testosterone. At birth, external genitalia look female. Some testosterone is normally metabolized to oestrogen ... this can be enough to drive breast development female body shape. These people will have no idea they are not biologically female until periods don't appear at puberty. This condition is very, very rare. Most cases of androgen insensitivity has some residual capacity to respond to testosterone.

And yes.....I spent years doing research into steroid hormones. Now retired and out of date.

I think I remember Dr Emma Hilton tweeting about how sometimes the cells can be in bone marrow. It was a wonderful thought that you might carry part of every feotus with you.

It would be really helpful if you would tell us what your friend experienced and what aggressive reactions you witnessed?
As this thread stands, you have clarified nothing.

OP clearly hasn't thought of a good story to go with the claim yet.

You're as much a geneticist as I am King Charles.

Ah, but the OP identified as a geneticist, so you see that makes it so Last week the OP identified as a maths teacher, which was therefore also true.

She also identified that none of us silly MN wims have anything higher than GSCE Biology, so that also becomes reality, and we all to be greatly impressed by science-y gobbledegook being bestowed upon our fluffy pram-filled heads by greater intelligences.

This Is The Way.

Science isn’t the problem, but scientists can be

These people will have no idea they are not biologically female until periods don't appear at puberty.

which will almost certainly be investigated in a country with universal healthcare, but not necessarily in a country without, as it isn’t life threatening.

Very true....retained internal testes have a huge risk of developing malignant tumours.

Cant stress enough....complete androgen insensitivity is very rare.

I am retired and out of date now. The sad thing about getting out of date with a complex subject like this is that it happens very quickly, and you

And there are various reasons why somebody who is biologically female wouldn’t have periods.

.....forget a lot of stuff that was once second nature.

Whoops hit send.

Science isn’t the problem, but scientists can be

I don’t think the OP has displayed any evidence that they are a scientist.

I’m not sure that they have even looked this up on Wikipedia.

….The Truth and the Life (John 14:6) It’s almost like this is some kind of new religion, complete with indoctrination, apologetics, inquisitions and heresies punishable by (social media and career) death. Like Christianity it fucks over women, has little basis in fact. Is driven by a lust for power and money, children are abused and is blindly followed by believers.

But they say they’re a geneticist therefore it must be true! They have used big words and everything

What I don’t understand is how all these hostile, aggressive, hysterical rampaging women the OP speaks of are getting access to confidential laboratory tests.

Even the few people with CAIS would know they had a DSD by puberty when periods didn't appear, before they became athletes. Genetic testing would confirm it. Also, DSDs are rare. Even the countries that were prepared to cheat and recruit male people from impoverished baxkgrounds with DSDs to put into elite women's athletics managed to come up with, what, 6 or 7 people? In an entire generation of athletes. They can no longer do so as there is so much more scrutiny now. People knew for years that CS was male and people will notice if another male looking athlete who has never had a period shows up. Testosterone levels would be picked up in males the other DSDs that do go through male puberty

The whole 'what about DSDs' is another strawman distraction technique from the TRAs. Extremely rare, obvious, easy to test for and has absolutely nothing to do with genetically normal men in women's sport - like Lia Thomas, the NZ weightlifter and all the rest of they. All of whom are genetically typical XY men.