Is he mixing up people with 3 gonosomes?

Because these are not too rare. It’s one of the more frequent mutations.

But even a person with XXY is a male. Since the male gonosome is considered as a mutation of an X chromosome. Somewhere in the evolution of mammals and other vertebrates (or most likely much earlier) something messed up and created the Y chromosome from an X chromosome. That’s why genetic diseases are usually more frequent in males, since one branch of the X chromosome does not have some backup. It’s simply missing.

So whenever a person has one Y chromosome. It is considered male. The lack of a Y chromosome is considered a female.

This can also be seen in people with genetic disorders, such as three gonosomes. XXX is a female XYY is a male XXY is also a male.

And to everyone’s information: I am for Germany and we do not have two words for sex and gender.

I don’t understand what you English speakers are up to.

Well, since there is just one word in German for sex and gender, it’s the same thing here, some people try to use the English word gender (untranslated) here.

But I simply don’t understand why this is needed. It’s getting so mixed up and complicated, but at the same time it barely has any relevance. Because what does it add to society, dialogue or communication? German is a very precise language, and I don’t understand why some people try to soften it up with the English term of gender. It’s so weird.