One generation would not enable the 'fear' gene to overcome the 'altruism' genes. His point was quite accurate that just about anything can become a selective 'force' to a population. However, changes in allele frequency that fix in a population have specific requirements. The population needs to be isolated enough so any new alleles coming in do not 'thin out' the original. The population needs to be large enough to survive any Founder Effect. There are others but I'm too tired to think so I'll leave them until tomorrow.
Thanks.
I think I get the idea.
" There are others but I'm too tired to think so I'll leave them until tomorrow."
I was just thinking the same thing. I've been on here quite a while today (even with the shopping break) so I think it's time to pack it in for tonight and maybe continue tomorrow or maybe on another thread.
Thanks for the input and info. I have learned quite a bit today (although I'm not sure if I'll retain much at my age).
But it is genuinely fascinating.
Thanks to all again.