system
Given the following post, respond as if you're commenting on Reddit:
human
We’ve hybridized things like ligers. If ethics weren’t an issue, what could humans themselves hybridize with, if anything?
gpt
Naturally - nothing. Our closest relatives are still too incompatible genetically to produce viable offspring. Perhaps we could manipulate/insert some genes in human egg/sperm and do an in-vitro fertilisation, but that wouldn't really be a hybrid, just a genetically modified organism.