Ch 16.3 (Pg. 460-464): Darwin Presents His Case. Darwin and Alfred Russel Wallace -Alfred Russel...
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Transcript of Ch 16.3 (Pg. 460-464): Darwin Presents His Case. Darwin and Alfred Russel Wallace -Alfred Russel...
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Ch 16.3 (Pg. 460-464):Darwin Presents His Case
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Darwin and Alfred Russel Wallace- Alfred Russel Wallace was a
naturalist working in Malaysia, who also had similar ideas about evolution
- In 1858 Darwin and Wallace co-presented their theory to the Linnaean Society of London
- In 1859 Darwin published his book, On the Origin of Species
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Darwin’s Case for Evolution- Struggle for Existence
- More individuals are produced than can survive, and must compete with each other
- Variation and Adaptation- Some variations are better suited
to the environment than others
- Inherited variations that increase an organism’s ability to survive and reproduce are adaptations
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Darwin’s Case for Evolution- “Survival of the Fittest”
- Differences in adaptations affect an individual’s survival
- Organisms that are best adapted to their environment survive and reproduce better than others, and have the highest fitness
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Darwin’s Case for Evolution
- Natural Selection- Occurs when:1. More individuals are born than
can survive2. There is natural heritable
variation3. There is unequal fitness
between individuals
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Descent with Modification- Means that all organisms are
descended from a common ancestor- Many generations must pass on traits
with slight modifications to create new species