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NATURAL SELECTION AND THE PEPPERED MOTH OF ENGLAND
Transcript of NATURAL SELECTION AND THE PEPPERED MOTH OF ENGLAND
THE PEPPERED MOTH OF ENGLAND Case Study by Jessica Kim What Is
Natural Selection? Peppered Moth has to be adapted to the polluted environment He released the pale and black moths into two different forests Result The unequal survival and reproduction that results from the presence or absence of particular traits
It is firstly described by Charles Darwin to explain how it influences on the characteristics of populations to change. In the 1950s, H.B.D. Kettlewell of England's Oxford University did an experiment concerning a species of peppered moth. It was
nocturnal and eaten by birds The increasing number of dark moths
The increasing number of polluting factories They had to camouflage against the blackened trunks so they can less likely be seen by predators such as birds. Birmingham in central England (severely polluted)
Southern England’s Dorset Country ( No pollution ) In unpolluted Dorset – twice as many pale moths as dark moths were captured
In polluted Birmingham – twice as many dark moths were captured Peppered Moth
England - History 1. Until the mid-nineteenth century people have reported only pale, speckled peppered moths.
2. 1845 - they found a dark gray specimen
3. As the time passes, the dark gray moths were found more often
4. By the 1950s, most of them were dark gray moth Air pollution turned the trunks of trees from
white to black He placed hidden cameras n filmed how the birds react in both forests.
Consequently, birds more frequently ate the moths that did not coincide with the color of the tree trunks. Is this unequal survival due to predators ? In conclusion, he theorized birds were the cause of natural selection that brought the evolution of dark coloration in these moths. As dark moths survive more in a polluted area,
they gave more birth to their offspring than the pale moths do, so the next generation was comprised of more dark moths, so its population increases EVOLUTION