Ch22 lecture - Chapter 22 Descent with Modification: A...

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    Chapter 22 Descent with Modification: A Darwinian  View of Life
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     What is evolution? W e can define evolution as a change over time in the genetic composition of a population . Evolution  also refers to the gradual  appearance of all biological diversity.
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    Evolution is such a fundamental concept that its study is relevant to biology at every level, from molecules to ecosystems. Evolutionary perspectives continue to  transform  Medicine.  Agriculture.  Biotechnology.  Conservation biology
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    The Origin of Species Darwin developed two main ideas Evolution explains life’s unity and diversity Natural selection is a cause of adaptive  evolution
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    Overview: Darwin Introduces a Revolutionary  Theory A new era of biology began on November 24,  1859 The day Charles Darwin published  On the Origin  of Species by Means of Natural Selection Darwin 1
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    Descent with Modification
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    The Origin of Species Darwin developed two main ideas Instead he used the phrase descent with modification. Evolution explains life’s unity and diversity
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    Darwin made two major points in his book First point: Instead he used the phrase descent with modification. All organisms are related through descent from a common ancestor that lived in the remote past.
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  In the Darwinian view, the  history of life is like a tree With multiple  branchings from a  common trunk to the  tips of the youngest  twigs that represent  the diversity of living  organisms Figure 22.7 Hyracoidea (Hyraxes) Sirenia (Manatees and relatives) Years ago Millions of years ago Deinotherium Mammut Stegodon Mammuthus Platybelodon Barytherium Moeritherium Elephas maximus (Asia)
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Ch22 lecture - Chapter 22 Descent with Modification: A...

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