BZ 220, Week one notes
BZ 220, Week one notes BZ 220
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This 2 page Class Notes was uploaded by Courtney Parks on Sunday January 17, 2016. The Class Notes belongs to BZ 220 at Colorado State University taught by Angeloni, Lisa Maria in Fall 2016. Since its upload, it has received 493 views. For similar materials see Introduction to Evolution in Biology at Colorado State University.
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Date Created: 01/17/16
Intro to Evolution January 19 2016 Week 1 Evolution o Descent with modification o Inherited changes in population of organisms over time, which leads to differences among them o Changes in allele frequency in a population from one generation to the next Effects of evolution are visible at many scales o Persistence of a new mutation o Change in frequency of a gene o Origin or loss of structures o Extinction of species Microevolution: small-scale changes within populations Macroevolution: large-scale changes that lead to speciation or higher lever diversification Evolution explains o Diversity and history of life o Similarities and differences among organisms o Traits that serve a function and those that don’t Applications of Evolution Diseases o Infectious o Genetic Agriculture o Artificial selection and genetic engineering Example: Modifying corn to make it sweeter o Pest resistance to insectides Natural Products o Aspirin Conservation o Inbreeding, genetic diversity Example: To rescue species going instinct o Distinguish species Understanding our own history, traits and diversity January 21 2016 Week 1 cont. Essentials of scientific inquiry o It’s guided by natural law o It has to be explanatory by reference to natural law o It is testable against the empirical world o It’s conclusions are tentative o It’s falsifiable (not necessary for inference in “historical” science) Scientific Method o Differs from experimental science o Makes predictions that can be tested against observable natural phenomena o Scientific discovery works at the edge of certainty Natural Selection o A trait within a population with a variation of a genetic basis o Some of the traits help with better survival and reproduction, which would then predominate in the population o “Struggle for Existence” More are born than can survive Example: The giraffes long neck have easier access to food which betters the chance of survival o New species form over time o Homology: shared traits inherited from a common ancestor “Evolution is just a theory” o Some theories are factual and supported by many tests Definitions o Fact: proven observations by repetition o Law: generalizations about the natural world under specific circumstances o Hypothesis: testable statement to build explanations o Theory: well-substantiated explanation of the natural world Key points o Evolution doesn’t support or refute the existence of a higher power o Theory of Evolutions mainly describes changes after life arose o All theories are subject to skepticism, testing and scorn o Experimental evidence differs from historical evidence
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