system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If humans and chimpanzees share ~98% of their DNA with each other, then why do human siblings share only 50% of their DNA?
gpt
Humans and chimps share 98% of the available selection of genes from which the choices which define an individual could be made.  Human siblings share 100% of that measure - they share 50% of the actual choices which are made from that.