Chapter 4 - Chapter 4 (4.1) Chemical Evolution- Simple...

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Chapter 4 (4.1) Chemical Evolution - Simple inorganic compounds in the earth’s early atmosphere might have reacted to produce amino acids, simple sugars, and other organic molecules used as building blocks for the proteins, complex carbohydrates, RNA, and DNA needed for life. The first phase involving organic molecules, biopolymers, and systems of chemical reactions needed to form the first cells. Biological Evolution - results from changes in the genetic makeup of populations, NOT INDIVIDUALS. 4 kinds of evidence for life in past - Fossils: mineralized replicas of skeletons, bones, teeth, leaves, seeds, etc; gives us most of what we know about the earth’s life history. DNA of living species compared to past organisms. Ice cores drilled from glacial ice and examine the kinds of life found at different layers. Chemical analysis of rocks tells us the conditions in which the rocks were formed. (4.2) Theory of evolution - Changes seen over time results from the descent of species from ancestral species and explains why life is so diverse today. Microevolution - describes small genetic changes that occur in a population. Macroevolution - describes long-term large-scale evolutionary changes through which new species arise from ancestral species and other species are lost through extinction. Gene Pool
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This note was uploaded on 03/19/2008 for the course ISB 202 taught by Professor Johnson during the Fall '08 term at Michigan State University.

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Chapter 4 - Chapter 4 (4.1) Chemical Evolution- Simple...

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