Ok, so I kinda knew that.
So, I am struggling to wrap my head fully around common ancestor and how that ties in with inbreeding.
So one little monkey, has fun time with another monkey, and they have 2 baby monkies, monkey one goes on to become humans, the other goes onto become chimpanzees.
So monkey 1 is our concestor with chimps. however, even if monkey 1, were to mate with 5 females, the grandchildren would all be very inbred.
Can somebody draw me a tree of how 1 ancestor gets enough genetic material to mix it up? Because surely it can't get that many from the species it split with, or it would not be the common ancestor, and the whole process would start again.
You're confused because that's not the way evolution works. You're close, but "common ancestor" does not imply
individual.
Evolution occurs over
populations.
So, Population A is comprised of 20,000 individuals. Something happens, and that population splits into two daughter populations - Pop. B and C, each with around 10,000 individuals. These two populations, if they do not interbreed, will continue to evolve in divergent pathways. Population B could be the ancestors of humanity, while Population C could be the ancestors of chimpanzees.
No inbreeding required.
The separation of populations can happen for any number of reasons - natural disasters, migration due to overpopulation, what have you.
Edited by Rahvin, : No reason given.