Spring 2018 Lab 2.1.pptx - Lab 2 Mechanisms of Evolution...

  • Hunter College, CUNY
  • ANTHP 105
  • Lab Report
  • RebeccaAlexander87
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Lab 2Mechanisms of Evolution
EvolutionA change in the genetic structure of a population.A change in allele frequencies in a population through time.
Forces of EvolutionMutationGene flow Genetic driftNatural selectionThese factors are responsible for the production and redistribution of variation of alleles!All together are responsible for evolution
MutationOnly wayto produce new variationOnly heritable in sex cells (sperm/egg)Most mutations are neutral, but some that are beneficialand those can be passed onChange in DNA (lots of different ways it can happen)New alleles in a population New alleles = new variation
MutationExample: Sickle cell anemiaPoint mutation in DNA(A where Tshould be in stringof nucleotide bases)Subsequent change in the mRNAthat reads the DNACascade effectcausesproduction of a different amino acidwith totally different biophysical properties
What normal blood looks likeHemoglobin: What does it do?
What effect does this mutationhave?
Mutation-Increasesallele diversityABABAB ABABBBACCCCCCCCCCAn advantageous mutation may spread throughout the population.
Gene Flow-Increaseallele diversity (among groups)Exchange of genes between populationsMigration with reproductionCan’t CREATEvariation, only redistributeitA A AA C AC C AC C CA C AC A CBBBDDD
Genetic Drift-Decreasesallele diversityChanges in allele frequencies produced by randomfactorsE.g., Founder Effect

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