Intro to Evolution.

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Presentation transcript:

Intro to Evolution

Spontaneous Generation Biogenesis Life from living things Abiogenesis life from non-living things – Spontaneous Generation

Believed that fish came from mud Aristotle Believed that fish came from mud

Recipe for Mice By: Anton von Helmont 1. Get a Box 2. Add some dirty underwear 3. Put in some rice 4. Place in a dark cellar 5. After 21 days, you’ll have mice http://www.youtube.com/watch?v=WNByRghR6sw

Who disproved spontaneous generation and how?

Francisco Redi In 1668, used flies and meat in his experiment to show that flies did not come from meat but from maggots (baby flies)

Louis Pasteur Disproved spontaneous generation once and for all Filled S-shaped flasks with broth. Boiled the broth to kill any microorganisms already in the broth and in the air Found no Life after 1 year

Animation http://www.sumanasinc.com/webcontent/animations/content/scientificmethod.html

The Heterotroph Hypothesis Early earth organisms: Prokaryotic (simple organisms) Anaerobic (no oxygen in atmosphere) Heterotrophs (take in nutrients)…no chloroplasts…yet!!

The Heterotroph Hypothesis Once oxygen production occurred, aerobic prokaryotes developed Large heterotrophic cells consumed small cells as food Endosymbiont hypothesis  symbiotic relationship between large and small cells developed Small cells became mitochondria and chloroplasts with their own DNA

Natural Selection Charles Darwin – traveled to Galapagos Islands Proposed that new species could develop by natural selection

Natural Selection Process: Overproduction in populations leads to competition for resources Variation of traits leads to different phenotypes different strengths & weaknesses Due to sexual reproduction Competition for limited resources leads to winners and losers Survival of the fittest (best adapted) leads to higher reproductive success

Adaptations Any heritable trait that suits an organism to its natural function in the environment (niche) HOW you live Structural adaptations Mimicry and camouflage Behavioral adaptations Herding, schooling, growling Physiological Adaptations Enzymes, sight, oxygen-binding of hemoglobin http://www.youtube.com/watch?v=EJGtN-igCu8 mimicry

Animations http://www.youtube.com/watch?v=GhHOjC4oxh8 evolution (8 min) http://www.youtube.com/watch?v=0SCjhI86grU natural selection (9 min)