I’m also not a geneticist but I did study genetics for a while and that’s pretty much what I remember learning, so you’re good.

The books Mutants: On Genetic Variety and the Human Body by Armand Marie Leroi explains it all very well and touches on many other related genetic conditions like the Klinefelter syndrome (XXY). It’s an incredible read all around that really opened my eyes to how malleable biology is.