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Natural Selection - Some Examples of Natural Selection...

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Some Examples of Natural Selection % Antibiotic resistant bacteria - this is the ability of bacteria to survive an attack by an antibiotic and is an excellent example of natural selection at work. Bacteria that develop a mutation that allows them to survive an antibiotic will live long enough to reproduce and so spread the 'survival' gene to subsequent generations. Those bacteria with this gene will survive and become more numerous in the bacterial population. % Fast-evolving deer mouse - found in sandy soils in Nebraska. Over a period of several thousand years the deer mouse evolved a pale coat that helped it to evade predators. Deer mice are widespread across North America, but they usually have dark coat, so that they can blend into dark soils and stay hidden from owls. Scientists at Harvard and at the University Of California at Berkeley discovered a single gene called Agouti in light coloured mice which is expressed in higher amounts and for longer than the genes that code for dark hair. The gene emerged about 4,000 years ago, which was only a
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