Flassification and Evolution

Flassification and Evolution - Order in the natural world...

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Unformatted text preview: Order in the natural world- Classification and Evolution chapter 3 of textbook 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 • 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 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 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. What evidence is there for evolution?...
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Flassification and Evolution - Order in the natural world...

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