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Natural Selection and Evidence for Evolution
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Most will die before they reach adulthood because
there are not enough resources, like food and space, for them all
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Individuals that have variations adapted to
their environment are more likely to survive
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We call this 'survival of the fittest' or natural selection
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Evolution
This is the slow and continuous change of organisms from one generation to the next
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He observed
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Populations oforganisms show variation because of differences in their genes
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Populations of organisms don't increase quickly in size because individuals have to compete with
each other for resources
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So, the genes responsible for the
useful characteristics get passed on to the next generation
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e
Overa long period oftimetheir will be a higher proportion of individuals with beneficial
characteristics, compared to those with poorly adapted characteristics
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Evidence to support Evolution
1
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Closely related species evolved to become different
species, caused by diverged gradual changes in their
DNA
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This is what scientists
found e
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humans, anes and chimns have similar DNA
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Resistant Organisms
Warfarin is a poison used to kill rats
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Now we have populations of rats that
are warfarin-resistant
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Due to the different environments the two separated populations develop different
characteristics, which become more common in each population, due to natural selection