Stop!
Before you give me your high school genetics explanation about how there are only two genders, here’s some stuff you probably didn’t learn in the 10th-grade biology class:
- Mendel cooked his data.
- There is evidence to support that eye color is determined by at least fifteen gene pairs. Let me know when you’ve worked out the Punnett squares for that.
- Phenotypes do not always match genotypes.
- Genetic cross-over happens a lot.
- Humans are not peas.
- Your HS biology teacher probably only had two weeks to teach a very complicated subject. A lot of corners were cut.
Consider that before attempting to explain gender genetics to me.
Memoirs of an Earthling 
Good job Mendel didn’t look at slugs or clownfish