00:01
So here we're asked why altruism is a trait that is difficult to explain using evolutionary theory.
00:09
The reason is if i am sacrificing my own fitness to improve someone else's, then by definition we are losing fitness of that individual due to this trait, and so this trait would be selected against.
00:30
This corresponds to answer choice one, that genes of those who make sacrifices should not survive to be passed on.
00:36
Now, the reason why altruism actually does exist, and this is a little bit beyond the scope of this question, but i think it's still good to go over this a bit, is because when we have closely related individuals to us that benefit from this altruistic behavior more than we detriment from it, we're actually increasing not our individual fitness as an organism, but the fitness of our genes.
01:01
As these closely related individuals around us that benefit, actually, have a lot of our genes conserved...