Yes, Rose, that is the answer. The thread goes on:
Wait,” he said, pausing. “Is that an actual thing by the way?”
Here, I knew he was now willing to listen.
I went on to show that the sex of crocodiles was determined by the temperature their eggs incubated at. His interest piqued more
and,
Now, he wanted to know more about how other animals determined sex.
After providing him with a database showing thousands of unique sex determination mechanisms across species and how they all result in males and females, I returned to humans..
and,
I showed him that what matters in human sex determination is the genes within the chromosomes, that genes determine the reproductive anatomy you will develop, and thus, your sex.
To do this, I showed him the typical path for a human male and the path for an XX male.
and,
The XX male example illustrated to him that, even though this male had XX chromosomes, what mattered to his development was the presence of the SRY gene.
This showed him that chromosomes and sexes were separate things.
It was then he started to change his opinions.
and,
He told me: “I see. Sex is the manifestation of the genes rather than the chromosomes in and of themselves.”
I responded, “Exactly!”
This is how teaching should work, leading one through the logic so the person can reach the conclusion themselves
The thread continues but I can’t copy it all.