PSYA01H3 Chapter Notes -Natural Selection
Document Summary
Biological evolution, changes that take place in the genetic & physical characteristics of a pop n or group of organisms over time. Adaptive significance, the effectiveness of behvr in aiding organisms to adapt to changing env t conditions. > bhvrl differemces correspond to genetic & biological differences. > ultimate causes (biology), evolutionary conditions (past env t events) that have slowly shaped the behvr of a species over generations. > proximate causes (env t), immediate env t events & conditions that affect behvr. > testosterone f/ nearby gerbil brothers in the womb acts as proximal cause for the subsequent devlpt of sexual behvrs in these males; its absence, when a male dlvps next to sisters causes a deficit in sexual proficiency. > there are 2 breeding strategies for gerbils, males who are better sexual performers & males who are better parents (dlvpng next to sisters) where both present selective value.
