How Does Evolution Occur?

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Darwin and His Theory of Evolution by Natural Selection

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Presentation transcript:

How Does Evolution Occur? “Nothing in Biology makes sense except in the light of evolution.” Theodor Dobzhansky biologist

What were Some Early Explanations for Evolutionary Change? Jean Baptiste de Lamarck (1744-1829) Desire to change- living things have an inborn urge to become more fit for their environment Use and Disuse- organisms can alter their shape by using their bodies in new ways Passing on Acquired Traits- characteristics obtained during a lifetime are passed on to offspring

What is the Current Theory of Evolutionary Change? Charles Darwin Evolution by Natural Selection

Living Things Overproduce More offspring are created that can survive

Offspring Vary in their Traits No two offspring are exactly alike due to gametes having different sets of genes mutations

There is a Struggle for Existence Against each other Mates Food Shelter Habitat

Survival of the Fittest The best adapted offspring survive and pass their genes (traits) on to their offspring

Questions How did the artificial selection carried out by farmers help Darwin develop his theory of natural selection? What are the four points of Darwin’s Theory of Natural Selection. Compare the ideas of Darwin and Lamarck regarding evolution. Were Lamarck’s ideas truly scientific? Why or why not? What did Darwin mean by “fitness”?