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Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. Gene flow includes lots of different kinds of events, such as pollen being blown to a new destination or people moving to new cities or countries. Genetic Drift. Genetic drift is the change in frequency of an existing gene variant in the population due to random chance. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It could also cause initially rare alleles to become much more frequent, and even fixed. Problems: Over time, the movement of people on Earth has steadily increased. This has altered the course of human evolution by increasing ________. A) gene flow B) genetic drift C) nonrandom mating D) geographic isolation The Dunkers are a religious group that moved from Germany to Pennsylvania in the mid-1700s. They do not marry with members outside their own immediate community. Today, the Dunkers are genetically unique and differ in gene frequencies, at many loci, from all other populations including those in their original homeland. Which of the following mechanisms likely explains the genetic uniqueness of this population? A) Heterozygote advantage and stabilizing selection B) founder effect and genetic drift C) mutation and natural selection D) population bottleneck and Hardy-Weinberg equilibrium #NikolaysGeneticsLessons #heredity #Genetics #CharlesDarwin #NaturalSelection #evolution #offspring #populationGenetics #species #population #generation #alleleFrequency #allele #selectivePressure #sexualSelection #nonrandomMating #preferredTraits #fitness #Mutation #DNA #geneticDrift #chance #geneFlow #GodfreyHardy #WilhelmWeinberg #HardyWeinbergEquation #HardyWeinbergEquilibrium #Phenotype #Genotype #earwax #mendelianTrait #Homozygous #Heterozygous #evolutionaryBiology
