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How Does Evolution Happen

This section exlains what Charles Darwin saw on his journeys and how he developed his theory of natural selection. We will also explore some examples of natural selection in action.
by

Robert Williford

on 15 January 2014

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Transcript of How Does Evolution Happen

In this section we will discuss Charles Darwin's exploration and how his observations led to his theory of natural selection. Then we will explore natural selection in action.
Charles Darwin
Darwin's Finches
Darwin Does Some Thinking
Natural Selection
Natural Selection in Action
Charles Darwin was a scientist in the 1800's that signed on to be the naturalist(study nature) on a voyage around the world. On his voyage he collected samples of thousands of plants and animals and kept detailed observations and notes in his notebook. Some of Darwin's most famous observations came from his visit to the Galapagos islands (about 600 miles west of South America). Here he noticed some interesting comparisons between birds called finches.
traits -
a distinguishing quality that can be passed from one generation to another.
selective breeding -
the breeding of organisms that have a certain desired trait.
How Does Evolution Happen and Natural Selection in Action
"Why are finches on the islands similar but not identical to the finches on the mainland?"
Darwin learned from animal and plant breeders such as farmers.
Natural Selection -
the process by which organisms with favorable traits survive and reproduce at a higher rate than organisms without the favorable trait.
generation time -
the period between the birth of one generation and the birth of the next generation.
speciation -
the process by which two populations of the same species become so different that they can no longer interbreed.
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