10 3 Lecture Summary Natural selecton Natural Selection Selection and Genetic Drift In order for selection in a population you need variation in the population Positive selection advantage for an allele increases in population Negative selection disadvantage for allele disappears in population What produces selection Genetic environment Physiological developmental environment Internal environment External environment Physical environment Biological Environment competition predation parasitism food supply mate selection Success can be judged in 2 ways Absolute terms Relative terms genomes making this one relatively not the best Will the genome work does it allow for a living and functional organism Is it the best genome available there may be others with superior Slight advantages can cause HUGE changes over time The selection against a dominate trait will cause RAPID elimination Selection against recessive is much slower Fitness survivability of one group compared to another Fitness of best allele is ALWAYS 1
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