Non-selective evolutionary processes:Genetic Drift in natural populations-Founder Effect: New population likely to have different allele frequencies than source population, by chancePopulation Bottleneck: results when most individuals in a large population die, due to earthquakes, floods, fire, droughtNorthern Elephant Seal, cheetahGenetic Drift: Effect on fitness- Random Effect on genetic variation: DecreaseGene flow (migration)- migration of individuals between populations, movement of gametes or offspring between populationsCan introduce new alleles to populationsMakes populations more genetically similarGMO Corn crop and gene flow argumentGene flow (migration) between populations mixes up alleles and keeps populations similarGene flow makes populations more similarToo much can inhibit adaptation in “edge” populations experiencing different selection pressuresWhen it’s good: new alleles are introduced to a population with low diversity (can provide a new variation for selection to act on)The absence of gene flow allows the opportunity for independent genetic changesEffect of Climate change on organismsPhenology- the seasonal timing of important life history eventsLife history events are often triggered by environmental conditionsCan also be determined by genesBIOM 150 1nd Edition Lecture 13Outline of Last Lecture I. Natural and Sexual SelectionOutline of Current Lecture II. Genetic DrifIII. Gene FlowIV. Climate changeCurrent Lecture Non-selective evolutionary processes:- Genetic Drift in natural populations-- Founder Effect: New population likely to have different allele frequencies than source population, by chance- Population Bottleneck: results when most individuals in a large population die, due to earthquakes, floods, fire, droughto Northern Elephant Seal, cheetah- Genetic Drift: Effect on fitness- Random Effect on genetic variation: Decrease- Gene flow (migration)- migration of individuals between populations, movement of gametes or offspring between populations- Can introduce new alleles to populations - Makes populations more genetically similar- GMO Corn crop and gene flow argument- Gene flow (migration) between populations mixes up alleles and keeps populations similar- Gene flow makes populations more similar - Too much can inhibit adaptation in “edge” populations experiencing different selection pressures- When it’s good: new alleles are introduced to a population with low diversity (can provide a new variation for selection to act on)- The absence of gene flow allows the opportunity for independent genetic changes - Effect of Climate change on organisms- Phenology- the seasonal timing of important life history eventso Life history events are often triggered by environmental conditions o Can also be determined by genesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a