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Ch 16.3 (Pg. 460-464): Darwin Presents His Case. Darwin and Alfred Russel Wallace -Alfred Russel Wallace was a naturalist working in Malaysia, who also.

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Presentation on theme: "Ch 16.3 (Pg. 460-464): Darwin Presents His Case. Darwin and Alfred Russel Wallace -Alfred Russel Wallace was a naturalist working in Malaysia, who also."— Presentation transcript:

1 Ch 16.3 (Pg ): Darwin Presents His Case

2 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

3 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

4 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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6 Darwin’s Case for Evolution -Natural Selection -Occurs when: 1.More individuals are born than can survive 2.There is natural heritable variation 3.There is unequal fitness between individuals

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8 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


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