system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How mitochondria first got replicated during cell division since they were a separate organism.
gpt
Mitochondria divide just like other cells (they even have their own DNA). Presumably, the mitochondria already replicated a few times inside the host cell, so when the host cell split, both daughter cells had mitochondria too. Think of it like adding a raisin (the mitochondria) to a ball of dough (the host cell). The raisin multiplied and distributed around the dough, and then the dough ball got split in half with raisins now in both halves.