The Theory of Evolution by Natural Selection The Theory of Evolution by Natural Selection.
Evolution: Natural Selection
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Transcript of Evolution: Natural Selection
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Evolution:Natural Selection
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Evolution• Change in inherited characteristics over time.
(Descent with modification)
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Before the 1800’s few thought much about evolution 1. Most people thought the earth was only 6,000 years old (not 4.6
billion years old)
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2. Few traveled to see similarities in species
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3. Many people (of European descent) understood only the biblical story of creation.
http://mythicjourneys.org/bigmyth/
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In the 1800’s scientists started to change people’s minds….
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Lamarck• A French scientist who proposed that traits developed during a
parent’s life would be passed onto their kids.
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Example: giraffes stretch their neck to reach tall leaves, this results in a long neck. This trait is then inherited by the kids.
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Lamarck didn’t realize not all things are passed onto the offspring
=
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Plastic Surgery does NOT get passed onto your offspring!
Before surgery After surgery
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Genetics wasn’t described until the 1860’s by Mendel
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Charles Darwin• A British scientist who studied nature and noticed similarities among
animals.
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• He concluded that living things must be related and somehow they changed, or evolved, over time due to natural selection.
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Natural Selection• An organism with the best traits for their environment is more likely
to survive and reproduce
Which mouse is better suited for
this environment?
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Survival of the Fittest• Which moth has the
best traits for this environment? • What will happen to
the “unfit” moth?