BIOL 1001 Chapter : CH 19
Chapter 1
• 1.8 million species have been identified and classified
• with so many different species there are many different unifying similarities
A. Evolution is a central theme in biology
▪ Ability to evolve is built into organisms
▪ A change in the genetic makeup of a population over time as a result
of natural selection (survival of the fittest)
▪ Variations within every species (some tall, some short)
▪ Means some are “better” suited to survival (natural selection)
▪ Variability comes from genes and genes are inherited
Conclusion: more “good” genes survive and therefore the population changes
B. Life contains an order of structural levels with each level building on the
levels beneath it
>>>Hierarchy of biological organization
1. Biosphere
2. Ecosystems
3. Community
4. Population
5. Organism
6. Organ and Organ Structure
7. Tissue
8. Cell
9. Organelle
10. Molecule
11. Atom
12. Subatomic Particle
C. Each level of biological organization has emergent properties
D. Life has the ability to acquire materials and energy
E. Structural and function are related
F. Living things reproduce and cells are the basic unit of structure and function
G. DNA is the basis of heritable information
H. DNA also provides the instructional methods that guide the growth and
development of multicellular organism
I. Organisms have the ability to maintain their structure and regulate their
internal environment
Concept 1.2
• The Core Theme:
Chapter 2
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