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Chapter 1 - Chapter 1 Concept 1.1 Themes connect the...

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Chapter 1 Concept 1.1 Themes connect the concepts of biology About 1.8 million species have been identified and named. With so many different species here are many different unifying similarities 1—Evolution is a central theme in biology. - The ability to evolve is built into organisms. - Evolution is a change in the genetic makeup of a population over time as a result of natural selection. - Organisms within a species are variable - Variability means some are better suited to survival (natural selection aka survival of the fittest) - Variability comes from the genes and genes are inherited Conclusion: More “good” genes survive and therefore the population changes. 2 – Life contains an order of structural levels with each level building on the level beneath it. - Hierarchy of Biological Organizations 1. Biosphere: All of the environments on Earth that are inhabited by life 2. Ecosystems: All living things in a particular area, along with non-living environmental components with which life interacts (soil, water, air components, light) 3. Community: the entire array of organisms inhabiting a particular ecosystem 4. Population: individuals of a species living within the bounds of a particular area 5. Organism: individual living things 6. Organ and Organ System: Body part consisting of 2 or more tissues 7. Tissue: Group of cells from similar embryonic origins that combine to form organs 8. Cell: the fundamental unit of structure and function in life, (Neuron, hepatocyte) 9. Organelle: Various functional components that make up cells (chloroplast, mitochondria) 10. Molecule: chemical structure consisting of 2 or more atoms
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