BIOL 1201 Chapter : Biol 1201 Outline1
Document Summary
Chapter 1 themes in the study of life. About 1. 8 million species have been identified and named! With so many different species there are many similarities (see fig 1. 1). 1--- evolution is a central theme in biology. The ability to evolve is built into organisms. Organisms within a species are variable (e. g. , some are tall some are short) Variability means some are abetter@ suited to survival. 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 levels beneath it. Cant narrow in, must study whole and stay broad. >>>>> hierarchy of biological organization (see fig 1. 4) (the definitions for these are handled separately, here you should concentrate on the organization) Tissues (not present in prokaryotes or all eukaryotes) Organs (not present in prokaryotes or all eukaryotes) Organ systems (not present in prokaryotes or all eukaryotes)
