Also recognized by experts in genetics (I am not one of those but my Genetics professor at SDSU is) are X, XXX, XXY, and XYY. Other factors may enter into the development of persons with these aneuploidies, such as interaction with the influence of the other chromosomes in the mix.Apparently, she believes that there are other chromosome combinations than xx and xy which would be news to the scientific world. Or that's at least her implication since she doesn't believe xx and xy is a binary equation. Are there individuals that have some form of intersex/DSD conditions? Yes, they represent 0.016% of the population. There are individuals that have all sort of genetic shortcomings that prevents them from competing at a high level of athletics that represent a significantly higher percentage than those with intersex/DSD conditions.
In reality, an xx and xy standard is far more inclusive than any other standard. There are xx athletes like Caster Semenya that can't compete as a woman because they fail the testosterone test. What are the odds that Brittany Griner would have very elevated levels of testosterone? Reality, not philosophy, is the most reliable standard for athletic competition.