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Flassification and Evolution

Flassification and Evolution - Order in the natural...

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Order in the natural world- Classification and Evolution chapter 3 of textbook
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How do we classify things? By the similarities in their features These similarities are called characters Characters are distributed hierarchically; that is, the more similar things are, the more they will share in common. Fig. 3.1 Amoeba, filebox.vt.edu Viviparus intertextus Mushroom Lycopodium lucidulum
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Biologists think of characters in two ways: 1. General (a.k.a. primitive)- these are not diagnostic of a group at a certain level 2. Specific (a.k.a. derived) - are diagnostic of a group at a certain level Depending on what level you are talking about any character may be general or specific Example- hair is diagnostic when comparing a group of animals called mammals to non-mammals but hair is general to all mammals, so it is useless when trying to differentiate different mammals, like people and dogs
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Why do organisms share characteristics? They have a common ancestry; that is, organisms have evolved over time, and new species have developed from older ones New species retain some characters of their ancestral species while developing new characters Evolution, 3rd edition, fig. 3-14 by Strickberger
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Yeah right, evolution is just another theory! The problem with this statement is that people are using the word theory in two different ways: General public- “theory” is an idea that has not been tested well and has little verification Scientist- “theory” is a logically self-consistent model describing the behavior of a related set of natural phenomena. It is supported by experimental evidence and observation Thus, “Theory of Gravitation”, etc.
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What evidence is there for evolution?
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