Anthropology5_Problem_Set_4 - Anthropology 005 Introduction...

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Anthropology 005 Introduction to Physical Anthropology Problem Set # 4: Speciation, classification and the comparative method 1. There are millions of reproductively isolated species now in existence yet we believe all organisms are related. A. What does it mean to say that all organisms are related? It means that all organisms shared a common ancestor many generations ago. B. What is the best evidence that they are related? The best evidence that organisms are related is their shared characteristics, especially derived similarities for finding which organisms are most closely related. This evidence can also be seen through fossil records. DNA. Hereditary System C. The allopatric model suggests how new species might evolve. In general, what two circumstances are thought to be essential to the division of one interbreeding population into two reproductively isolated ones? Ecological separation of populations within the same geographic range can lead to the divisions of one interbreeding populating into two reproductively isolated ones. Also, this physical barrier causes the populations to breed with themselves and thus over time each species may have different alleles according to which is best for their reproduction and survival, eventually leading to different genes and not being able to reproduce with the original group. 2. Classification is important in biology for several reasons.
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This note was uploaded on 08/25/2011 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Anthropology5_Problem_Set_4 - Anthropology 005 Introduction...

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