Outline1a

Outline1a - OUTLINES FOR BIOLOGY 1201 Sections 003 and 004...

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OUTLINES FOR BIOLOGY 1201 Sections 003 and 004 Fall 2010 DR. STEVEN POMARICO 1A Chapter 1 – Themes in the Study of Life Properties of Life About 1.8 million species have been identified and named!! WITH SO MANY DIFFERENT SPECIES THERE ARE MANY SIMILARITIES (see fig 1.3). 1--- Evolution is a central theme in biology. Evolution is a central theme in biology. The ability to evolve is built into organisms. Change in a species of an organism over time. Change in genetic makeup of a population (frequency of certain traits changes over generations). Generation turnover effects the rate of this change (longer life = longer time to evolve, etc.). -organisms within a species are variable (e.g., some are tall some are short) -variability means some are better suited to survival. -variability comes from the genes and genes are inherited.
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Better traits give the individual a better opportunity to alter gene pool of the population by passing on these advantageous traits. Conclusion: More “good” genes survive and therefore the population changes. 2 --- Life contains an order of structural levels with each level building on the levels beneath it. >>>>> Hierarchy of biological organization (see fig 1.4) ( the definitions for these are handled separately, here you should concentrate on the organization ) -Atoms -Molecules -Macromolecules -Organelles (not present in prokaryotes) -Cells -Tissues (not present in prokaryotes or all eukaryotes) -Organs (not present in prokaryotes or all eukaryotes) -Organ systems
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Outline1a - OUTLINES FOR BIOLOGY 1201 Sections 003 and 004...

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