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

sorry, 'geneticist'

As if you're a geneticist.

Please do provide evidence.

violence is never acceptable and should be reported to the police.

Apparently a lot of CAIS people work as models because they tend to have very long thin frames with small hips and boobs 🤷🏼‍♀️ the condition certainly doesn't tend towards high athleticism.

What happened with your friend @Nimbostratus100 ?

I agree with you that a single test is insufficient. No test is infallible and testing technicians are human beings that could make a human error once in a while. The sports bodies should use the same process as they do with drugs testing - an A sample, and if that shows up positive for drugs/XY chromosomes then you test the B sample that is collected at another site/time. For 99.9% of athletes the A sample will give conclusive results and the B sample is there for the other 0.01% as a confirmation. The test isn't looking for a single Y chromosome, but the presence of a Y chromosome in the vast majority of sampled cells indicating a male sample.

We've all been through covid and remember the issues of false positives and negatives, so we should apply the same standards to testing athletes. The stakes can be so high if they are unfairly blamed for doping or being XY when they in fact aren't.

I cant write any more right now . I tried to keep up with the posts but they were coming too fast. I will try and catch up later, if there are not too many posts.

But I hope at least some people understand the results of testing a bit better now

Then surely you would give an account of this in your OP.
How can we understand what happened and where any fault lies if you don't say.

"Our cause"? Who is "us", Kemosabe?

OP, are you saying a friend of yours is an elite athlete and was tested as part of the routine sports testing?

OR are you saying a friend of yours had a genetic test and they found a Y chromosome? Because anyone having genetic testing is taken through a consent form before the test, and this kind of result is one possibility you are warned of.

Here is one of many many MANY examples of transwomen being aggressive and hostile.
https://twitter.com/BillboardChris/status/1643113696150048768

You've enlightened us precisely zero and failed to provide any evidence of your claim that this is happening to people now. What a silly thread.

So your friend has been tested, a chromosome has been found and, then what....

... people have told her and explained the need to test her again?

... people have confiscated all her ID documents, burned all her "wrong sex clothing", announced to everyone that she is really a man, tattooed her forehead with "Male" and loudly proclaimed that she is banned her from competing in women's sports?

I mean, I can see that the fact of a test might be a shock, but if I was told that, as a mum of a son, i'd been found to have a rogue Y chromosome and they needed to test to see if it was one of my son's ones floating around I would think it was pretty cool and fascinating. Not traumatic in the least.

If you are a geneticist, you will know that anecdata =/= evidence.

Mansplaining motherhood 🥱

“ignorant hysteria does not help in any way”

OP you might want to google the origin of the word “hysteria” and reflect on why that’s an incredibly offensive word to use in this context.

Yes I'd say "has given birth" is fairly conclusive of not bring a man.

And testing will be for everybody, because you cant insist on it for some, and not for others
Errr yes - that's exactly what happens now.

There is no problem here. There is no confusion. There is no way mistakes are made (unless by cheating - ie Russia).

Stop trying to make a point that is irrelevant.

so you will most likely have Y chromosomes in cells in multiple parts of your body, but you are still female, and have no male advantage in sport. That is the whole point

However, if you are tested, you might show up as male, there is that chance. In which case, you would need to be tested again

But that's the point. You don't show up as male.

You show up as someone with a small number of y chromosomes.

The results look different.

Genetic testing will eventually find evidence of a particular condition. If you live in a country with a universal health system it is more likely now that the condition will be picked up at birth or in childhood, because chromosomal abnormalities often have other symptoms that impact on health. The presence of a Y chromosome in your OWN cells always indicates that you are chromosomally male, even if a condition like CAIS has prevented your male organs from developing so you are externally phenotypically female.

This has nothing to do with microchimerism, which relates to the presence of ANOTHER individual’s cells in your body.

Nobody is suggesting that one Y chromosome in a random cell on your body makes you male.

what, by trying to explain some science, because people are harming our cause by showing ignorance of this science, and being hostile and aggressive with that ignorance?

The only one showing ignorance on this thread is you OP....

🤣🤣🤣🤣🤣

Finding Y chromosomes is not conclusive, but the reaction from some women, out of ignorance, is to react as if it is.

What reactions? There haven't been any afaik.

I shall pass your query over to Dr Emma Hilton, a developmental biologist (thread from 2018):

https://twitter.com/FondOfBeetles/status/1070098298885890050

This thread is giving me a head ache, I just want to say "kudos " to all the elite female athletes returning to sport after having babies.

I'm also a geneticist, what a surprise, and that is not how it works. They aren't integrated into my cheek cells and that's not what that study says. Genetic testing is perfectly aware of chimerism artifacts and finding 1 Y chromosome in sample from a woman that was 99.999 % X X would not lead to a diagnosis of male!

Op, seems like you're clutching at straws!

Of course we can easily see/test whether a person is male or female!