BIOM 182Bang, Michel(Christofer)2013 SpringWeek 12Lecture 13February 15Darwins IdeasTwo Main Points- Evolution explains unity and diversity of life- Natural Selection is the force behind adaptation to local conditionsHow Natural Selection Work- Observations-All species produce an excess of offspring. Populations stabilize in size- Inference 1- Environment cannot support all offspring that produced, many do not survive.- Observation-members population vary in their characteristics- Inference 2-Survivial and reproduction depend on inherited traitsTheory of Natural Selection1. Individuals in a population vary phenotypically2. Some variants fit better into their (current) environment than others3. Those variants produce more offspring4. If there is genetic basis to the variation…then5. Those alleles will increase in population over time= evolutionSelection and Evolution- Acts ONLY if the trait has a genetic basis- Acts ONLY if there is variation present- Does NOT CREATE new genes or alleles, nor does it create variationThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- DOES produce AdaptationDirectional Selection- Selection move the average phenotype in one direction or the other,depending on what the actual effect isDisruptive Selection- Selection favors variants at each extremeStabilizing Selection- Removes extreme variants from the
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