NSModernSynthesis

NSModernSynthesis - NS Modern Synthesis 9:00:00 AM Forms...

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NS Modern Synthesis 30/10/2007 08:00:00 Forms the basis for continuing evolutionary thought/research After Darwin: Two Schools of Though Naturalists o Evolution works by natural selection o Variation Part of a continuous spectrum Pressures act on whole organism Genes can have different effects depending on other  genes present  Studied natural populations Interested in problem of origin of diversity Asked ultimate  questions What? How? Why? Questions about why trait exists at all Addresses evolutionary significance for a trait and why  natural selection favors this trait Cost/benefit analysis View Based on phenotype Concerned with multiple species, biosphere Macroevolution Study of phenotypes (including behavior)
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Field botanists, zoologists, paleontologists Evolution  Change over a geographic range Emphasizes relationahip to environment Studied how diversity increase from individuals Horizontal evolutionary scheme Geneticists o Not convince of effects of selection o Focused on genes and characters and on their transformations o Variation  Discrete o Asked proximate  questions What? How? Why? Questions about immediate cause for trait Mechanism Concerned with environmental stimuli that trigger a  transformation  Concerned with underlying genetic and physiological  mechanisms Practical, biology View Based on genotype Concerned with individual
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Microevolution Study of individual genotypes Embryologoists, behavioral biologists, cytologists, and  geneticists Evolution  A change in gene frequency in a population
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NSModernSynthesis - NS Modern Synthesis 9:00:00 AM Forms...

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