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Founder effect
A few birds colonize an island → their gene pool differs from mainland population
Bottleneck
Cheetah population crash → survivors share most alleles
Peppered moth
Light moths declined as soot darkened trees; dark moths had selective advantage
Adaptation
Polar bear’s white fur for camouflage on ice
Homology vs Homoplasy
Bat wing & human arm = homology; bat wing & insect wing = homoplasy
Allen & Bergmann
Arctic fox (short ears, compact body) vs. fennec fox (long ears, slender body)