![]() As turned out, he stepped off the plane from one war zone into another. Wolfe had been looking forward to some hard-earned R&R after a grueling military tour overseas. It took many generations before the population of moths was mainly black in colour.Corporal Jonas P. The dark variety had always existed, but was the best suited variant when the environment changed. Note that this change in phenotype was not due to pollution making the moths darker. Over time, the black peppered moths became far more common in urban areas than the pale variety. The dark moths passed on the alleles for black wing colour leading to offspring with the black wing colour phenotype. This gave the black variety an advantage, and they were more likely to survive and reproduce. This meant that the mutant black moths were now camouflaged, while the white variety became more vulnerable to predators. This gave the white variety an advantage, and they were more likely to survive to reproduce.ĭuring the last half of the 1800s, airborne pollution in industrial areas blackened the birch tree bark with soot. Moths with a mutant black colouring were easily spotted and eaten by birds. This meant that they were camouflaged against the pale birch trees that they rest on. ![]() Natural selection: peppered moths example Light peppered moths camouflage themselves against light lichens on treesīefore the industrial revolution in Britain, in the early 1800s, most peppered moths were of the pale variety. If they survive then they are the ‘fittest’ for this environment, they reproduce and pass on the advantageous characteristics to their offspring. This means that only the organisms that have the best characteristics for that particular environment will survive. Individual organisms in an environment are ‘selected for’. During his life he came up with the theory of natural selection and how this drives evolution of new species.ĭarwin is associated with the term ' survival of the fittest ', which describes how natural selection works. Over many generations, the process of natural selection leads to evolution occurring.Ĭharles Darwin was a famous English naturalist. ![]() This means that the advantageous alleles of this variant organism are passed on to offspring. Natural selection is a process where organisms that are better adapted to an environment will survive and reproduce. ![]()
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