Natural Selection
Mechanism of evolution where organisms with advantageous traits produce more offspring, increasing trait frequency.
Real World
The peppered moth (Biston betularia) shifted from predominantly light-coloured to dark-coloured forms during the Industrial Revolution, as soot-darkened tree bark gave camouflage advantage to darker moths, reducing their predation by birds.
Exam Focus
State all three conditions — heritable variation, differential survival, differential reproduction — missing one loses marks.
How well did you know this?