essays -bio - 1 Evolution is a unifying theme in Biology o...

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1 Evolution is a unifying theme in Biology o Darwin’s theories Natural selection The survival of the fittest o The best trait survives because they ca beat the others. Decent with modification Each offspring is born with some slight mutation o Each is different The best trait survives Scientific theory An explanation of a set of related observations based upon tested hypotheses and supported by groups of researchers o Tapeworm feeding mechanisms and anatomy (Darwin’s theory) Trait exists b/c it’s good!! Duh Why? o Foraging o Predators Live inside intestines Parasite Ones who get the most food, get bigger
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Survival of the fittest Food already digested Tape worm doesn’t have its own digestive enzymes What if…. One day one of the outside worms, would have crawled into an intestine, and evolves so. Eventually wouldn’t use digestive system Optimal foraging Energy efficiency o Darwin’s theory explains: Fixed Action Patterns Just do it, not thinking, carried out until completion no matter what. How is this good evolutionarily? Those who have fixed action patterns survive b/c don’t spend time thinking about what to do, just do it. Territoriality
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essays -bio - 1 Evolution is a unifying theme in Biology o...

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