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BIOL 120 (13)
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BIOL 120 Macroevolution Notes.pdf
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Department
Biology
Course
BIOL 120
Professor
Christa R.Partain
Semester
Spring

Description
BIOL 120 MACROEVOLUTION Macroevolution: Big changes New species (speciation) Over a very long time What is a species? A group of individuals that, in nature, can interbreed & produce fertile offspring but cannot reproduce with members of other species. A single species makes up an impermeable container for its gene pool. Reproductive Isolation
 ▯ • Temporal Isolation Different breeding seasons No mating • Behavioral Isolation No mate attraction due to behavioral differences No mating • Ecological Isolation Different microclimates No mating • Mechanical Isolation Physical incompatibility of reproductive structures Attempted mating • Gamete Isolation Mating No fertilization Gametes don’t fuse – sperm does not penetrate egg • Hybrid Inviability Mating Fertilization Hybrid doesn’t survive long after conception • Hybrid Infertility
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