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Speciation

Speciation. The Process by which new Species Arise. Isolation . The mechanism that drives speciation 2 types Geographic Reproductive. Geographic. Physical features that prevent interaction Mountains, rivers, canyons, oceans, highways, fences, cities The isolation is External.

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Speciation

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  1. Speciation The Process by which new Species Arise

  2. Isolation • The mechanism that drives speciation • 2 types • Geographic • Reproductive

  3. Geographic • Physical features that prevent interaction • Mountains, rivers, canyons, oceans, highways, fences, cities • The isolation is External

  4. Reproductive - RIMS • Non-geographical factors • Prevent the production of offspring • Can happen before or after fertilization of an egg by a sperm: pre-zygotic and post-zygotic • The isolation is Internal

  5. Pre-Zygotic RIMS • Behavioral (ex. Mating dance) • Gametic (ex. Incompatible gametes) • Mechanical (ex. Incompatible genitalia) • Seasonal (Environmental reproductive trigger) • Habitat (Environmental reproductive trigger)

  6. Post-Zygotic • Developmental (embryo dies at some point) • Hybrid Inviability(has a defect/weak/runt) • Hybrid Sterility (fine, but sterile) • Polyploidy (more chromosomes, when mating, chromosomes from each parent don’t pair – usually only in plants)

  7. Speciation – Modes/subtypes • Allopatric – separation by a barrier • Parapatric – separation by a large space • Sympatric – preference that prevents interaction

  8. New Species – blue

  9. Which type of evolution is this? Allopatric

  10. Evolution 101 • http://evolution.berkeley.edu/evosite/evo101/index.shtml • Excellent website to help you learn evolution

  11. Salamanders in California • http://www.youtube.com/watch?v=YCoEiLOV8jc&safe=active • 3:45

  12. Speciation and Extinction • http://www.youtube.com/watch?v=YYEa4ZYU07I&safe=active • 9:18

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