Chapter 4 Test Review

Chapter 4 Test Review - Dr Marcum Exploring Environmental...

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Chapter 4 test review **Discuss the concept behind evolution through natural selection. (1) Organism face a constant struggle to survive and reproduce.   (2) Organisms tend to produce more offspring than can survive.   (3) Individuals of a species vary in their characteristics due to genes and the  environment.   (4) Some individuals are better suited to their environment and will survive and  pass their genes on in their offspring. **Discuss the various ways allopatric speciation can occur. The process of generating new species.  A single species can generate multiple  species.  Allopatic speciation = species formation due to physical separation of  populations.  Can be separated by glaciers, rivers, mountains.  The main mode  of species creation. Speciation results in diverse life forms.  Speciation generates complex patterns  of diversity above the species level.  Phybantric trees (cladograms) represents  the history of species divergence.  Scientists can trace when certain traits  evolved.  Show relationships between species. **Be able to interpret a cladogram **If extinction is natural, why should we be worried about it? Humans profoundly affect rates of extinction.  Humans are causing the sixth  mass extinction event by resource depletion, population growth, and  development. **Discuss the difference between habitat use and habitat selection.
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This note was uploaded on 05/05/2008 for the course ENV 1301 taught by Professor Larrylehr during the Spring '07 term at Baylor.

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Chapter 4 Test Review - Dr Marcum Exploring Environmental...

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