How did they begin? How did and egg develop to recieve DNA when that had never happened before and the male is independent of the female?
In: Biology
It evolved in early prokaryotes, around two billion years ago. Single-celled organisms. Some basic form of a [Pilus](https://en.wikipedia.org/wiki/Pilus) (reachy-grabby arm) or a [Conjunction tube](https://en.wikipedia.org/wiki/Bacterial_conjugation), two cells together and their walls open up letting stuff flow between them.
There’s a handful of theories about how it started. Parasites and viruses using other’s, something happening with the process of splitting in two, using the DNA from the things consumed. Sexual recombination has a lot of benefit over asexual, from repairing DNA errors in the next generation to making evolution a team-effort.
[There’s more.](https://en.wikipedia.org/wiki/Evolution_of_sexual_reproduction) (There’s always more.)
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