1Quiz 5 10:10-10:15AMGY 112: Earth HistoryThe Hadean and Archean EonsUNIVERSITY OF SOUTH ALABAMALast time we covered…Evolution 2: How it works1) Definition of Evolution2) Darwin's law of natural selection(gradualism, punctuated equilibria)3) examples of evolutionary development The Origins of the TheoryImportant Definitions:Evolution:the transgenerationalvariation that occurs when social or biological forms adapt to their environment.The Origins of the TheoryImportant Definitions:Involution:When organisms do not seem to outwardly change, despite modifications in their environmentsExamples include the horseshoe crab, dragon flies, mosquitoes and Lingula (pictured above)How does evolution work?Austrian Monk GregorMendel(1822-1884) experimented with peas in his garden and through his work, he made 2 important observations about evolutionary changes (these are now considered biological principles):1)Principle of segregationwhich states that genetically inherited features are passed on as separate, discrete units.They do not blend together. Today we call these units genes.2) Principle of independent assortmentwhich states that genetic traits are inherited independently. Chance and chance alone determines which combinations of genes will be transmitted from parent to offspring.
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