system
Given the following post, respond as if you're commenting on Reddit:
human
Could a human, animal, or any living being live with YY chromosomes?

Just in theory. I know that women are XX, men are XY, but nothing is YY. AFAIK there aren't even any disorders that give someone YY, but there are disorders for things like XXY. 

X chromosomes contain things which are vital to survival as humans, but could an animal or something like that live with YY?
gpt
The X chromosome has too many vital genes, without the X the zygote would be aborted. Any organism using XY sex determination requires the X for survival, while the Y contains only a few gene (Testes determining factor and some spermatogenesis genes). This is how females can survive without a Y chromosome.