EBIO 1220 Lecture Notes - Lecture 2: Continental Drift, Yellowstone Caldera, Archaeopteryx
31 Jan 2017
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Document Summary
A group of populations whose members have potential to interbreed in nature and produce viable, fertile offspring. Over time, genetic changes cause them to diverge into separate species. Use of different tree species within a forest. Fish in pelagic and benthic zones of water don"t mix. Females are selective for male color, song, behavior, etc. Tetrapod (4n) offspring cannot mate with diploid (2n) ancestors. Animal and plant diversification- 500 million years ago. First humans- 0. 2 million years ago (homo erectus, sapien, etc) All life relies on dna-rna-protein system (slight variations) Fossils: preserved remnants or impressions left by organisms that lived in the past. Fossil record- ordered array in which fossils appear. Allows us to study the evolutionary history of life on earth. Slanted in favor of species that had shells or hard skeletons. Only preserved in certain kinds of rocks. Mass extinctions- periodic and unpredictable mass extinction events.
