Anthropology 5 problem set 4

Anthropology 5 problem set 4 - Anthropology005

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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? When saying that all organisms are related, we are saying that they all have the same  ancestors. When we look down our line, you will notice that we all trace back to one animal.  The reason why we look different from our ancestor is because we are broken down into many  branches and over generations, our genetics change due to natural selection and adapting to  our environment. Our ancestor line is a long chain that goes back generations to the beginning  of life.  B. What is the best evidence that they are related? When you look at their structures, you can see similar aspects and how they are common.  They share similar patterns of similarities that do not deal with adaptation. The organisms  share the same basic bone structures. Such examples are a bat, a mole, and a dugong which  have similar basic bone structure in their forelimb. 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? The two circumstances that are thought to be essential to the division of one interbreeding  population is the parapatric and sympatric speciation. Parapatric speciation is when a new 
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This note was uploaded on 11/11/2009 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Anthropology 5 problem set 4 - Anthropology005

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