Dr. Johnson Varkey was reinstated by St. Philip’s College after his law firm claimed he was "wrongfully fired" for teaching "widely accepted concepts of biology."
Do you disagree that in biology sex is determined by X and Y Chromosomes? I would love to see a citation otherwise as that is pretty undisputed biology.
"The slowly increasing understanding and acceptance of intersex people exemplifies how scientists and society still have a lot to learn about biological sex and the ways sex determination occurs in humans. Though biologists have an understanding that chromosome combinations influence the biological sex that an embryo develops as, biologists still know very little about the specific genes and mechanisms that control the sexual development pathway. Additionally, there are many factors beyond chromosomes that influence the sexual characteristics a person develops, and scientists are continually uncovering more intricacies in the development process. Finally, the events that lead to atypical sexual development have to be further explored."
That doesn't disprove what was stated. It proves what I stated.
From you cite
Humans who inherit two X chromosomes typically develop as females, while humans with one X and one Y chromosome typically develop as males. That is what triggers the male or female. That is why we are a binary species. Intersex is a deviance in the development.