Anthro_PS4

Anthro_PS4 - Anthropology 5 Introduction to Physical...

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Anthropology 5 Introduction to Physical Anthropology Problem Set # 4: Speciation, classification and altruism 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? All organisms share one common ancestor; the original DNA based life form. B. What is the best evidence that they are related? All organisms implement the same molecules to encode and interpret hereditary material to offspring. 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? Complete barrier to gene flow and divergent selective pressures. 2. Classification is important in biology for several reasons. A. In principle, why should biological classifications be hierarchical? So that the classifications based on the method of branching can be characterized into more inclusive groups. This way, we can trace our way back to older common ancestors that link together
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Anthro_PS4 - Anthropology 5 Introduction to Physical...

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