Evolution in action Evolution in action Peppered Moth

Evolution in action Evolution in action Peppered Moth (Biston betularia) 2 types: Speckled (white) and Melanic (dark) Peppered moth

Evolution in action Year % dark % light 1848 5 95 1895 98 2 1995

19 81 clean air, light-coloured bark pollution, dark-coloured bark Clean Air Act, light-coloured bark industrial melanism

Evolution in action Melanic and speckled moths on lichencovered tree trunk. Can you even find the speckled

moth? Evolution in action Melanic and speckled moths on soot-covered tree trunk Evolution in action Why did the population change? early 1800s = pre-industrial England low pollution

lichen on trees = light coloured bark Melanic gene selected OUT late 1800s = industrial revolution factories = soot/ash coated trees killed lichen = dark coloured bark Melanic gene selected IN mid 1900s = pollution controls

clean air laws return of lichen = light coloured bark Melanic gene selected OUT Survival of the Fittest

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Evolution in action Evolution in action Peppered Moth

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