Anjali- AP Enviromental- Chapter 7 Notes

Anjali- AP Enviromental- Chapter 7 Notes - Chapter 7...

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Chapter 7 Biological Diversity Biological Diversity and Biological Evolution •Biological Diversity –The variety of life-forms commonly expressed as the number of species in an area •Biological Evolution –The change in inherited characteristics of a population from generation to generation –One of the features that distinguishes life from everything else in the universe Four Processes that Lead to Evolution •Mutation •Natural Selection •Migration •Genetic Shift Mutation •A chemical change in a DNA molecule •Affects the expressed characteristics when cells or individual organisms reproduce Natural Selection •4 Characteristics: –Genetic Variability •Inheritance of traits from one generation to another and some variation on these traits –Environmental Variability –Differential Reproduction that varies with the environment –Environmental Influence on survival and reproduction •Species: –a group of individuals that reproduce with each other Migration •Two new species evolve from an original species due to isolation
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Anjali- AP Enviromental- Chapter 7 Notes - Chapter 7...

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