Ch14 How Biological Diversity Evolves

Ch14 How Biological Diversity Evolves - Chapter 14- How...

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1. Evolution of New Species i. Biological diversity increases thru speciation (formation of new species) 1. The major aspect of macroevolution [14.2] A. What is a species? a. “Species” originally Latin for “kind” i. Two organisms were same species if they looked alike b. Biological species concept i. Species- groups of populations that potentially interbreed in nature to produce fertile offspring 1. Share the same gene pool 2. Are reproductively isolated from other populations ii. Is not useful concept for all organisms 1. Ex: fossils, bacteria B. What keeps species from interbreeding? a. Reproductive barriers [14.4] i. Intrinsic factors that keep gene pools from mixing 1. Prezygotic barriers- factors that prevent successful mating a. Habitat (ecological) isolation- two species use different resources/habitats i. Ex: deer mice (woods) and field mice (open fields) b. Temporal isolation- active/mate during different times of days/seasons i. Ex: 5 frog species in one area breed at different weeks in spring c. Behavioral isolation- different courtship cues i. Ex: bower birds
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Ch14 How Biological Diversity Evolves - Chapter 14- How...

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