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Transcript
CHAPTER 6 ADAPTATIONS OVER TIME SECTION 1 IDEAS ABOUT EVOLUTION EARLY MODELS OF EVOLUTION LAMARCK – SAID CHARACTERISTICS DEVELOPED BY INDIVIDUALS OVER TIME WERE PASSED ON TO OFFSPRING – WRONG DARWIN – THEORY OF EVOLUTION BY NATURAL SELECTION – ORGANISMS WITH TRAITS MORE SUITED TO THEIR ENVIRONMENT ARE MORE LIKELY TO SURVIVE AND REPRODUCE – TRAITS ARE PASSED ON POPULATIONS COMPETE FOR LIVING SPACE, FOOD AND OTHER RESOURCES PRINCIPLES OF NATURAL SELECTION ORGANISMS PRODUCE MORE OFFSPRING THAN CAN SURVIVE VARIATIONS OCCUR AMONG INDIVIDUALS OF A SPECIES SOME VARIATIONS ARE PASSED ON SOME VARIATIONS ARE HELPFUL FOR SURVIVAL AND REPRODUCTION, AND ARE PASSED ON TO OFFSPRING OVER TIME, INDIVIDUALS WITH HELPFUL VARIATIONS MAKE A LARGER POPULATION VARIATIONS AND ADAPTATIONS VARIATIONS RESULT FROM MUTATIONS IN AN ORGANISMS GENES VARIATIONS CAN BE SMALL OR LARGE IF INDIVIDUALS W/ VARIATION CONTINUE TO SURVIVE AND REPRODUCE A NEW SPECIES CAN EVOLVE ADAPTATIONS MAKE AN ORGANISM BETTER SUITED TO ITS ENVIRONMENT CHANGES IN SOURCES OF GENES GENETIC MAKEUP OF A SPECIES MIGHT CHANGE ITS APPEARANCE GEOGRAPHIC ISOLATION INDIVIDUALS MAY BE SEPARATED FROM REST OF POPULATION AND DEVELOP VARIATIONS CAN ALSO DEVELOP GENE MUTATIONS TO ADD VARIATIONS SPEED OF EVOLUTION GRADUALISM – SLOW PROCESS OF EVOLUTION OVER LONG PERIOD OF TIME PUNCTUATED EQUILIBRIUM – SUDDEN CHANGE IN POPULATION DUE TO GENE MUTATIONS PUNCTUATED EQUILIBRIUM TODAY BACTERIA BECOME RESISTANT TO ANTIBIOTICS QUICKLY AND ARE ABLE TO SURVIVE - PNEUMONIA