Does gene flow increase or decrease genetic variation within a population between populations? Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. Which type of selection would result in largest loss of variation in a population? is defined as any change in allele frequencies in a population that is due to chance. a reduction in diversity of alleles in a population resulting from a sudden reduction in the size of that population ( population bottle neck) due to a random event. What is the term for the loss of genetic variation due to an event that decreases the size of the entire population? Gene flow within a population can increase the genetic variation of the population, whereas gene flow between genetically distant populations can reduce the genetic difference between the populations. Does gene flow decrease genetic variation? Mutations can introduce new alleles into a population of organisms and increase the population’s genetic variation. but gene flow may decrease genetic variation in source population if alleles leave with emigrating individuals. change in allele frequencies that occurs when a new population is established. Genetic drift decreased genetic variation within populations and increased genetic differences between populations. What decreases the number of genetic differences between populations? Genetic drift can also cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of new species. Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool. What decreases genetic variation in a population? 5 Does gene flow increase or decrease genetic variation within a population between populations?.4 Does gene flow decrease genetic variation?.3 Do mutations decrease genetic variation?. 2 What decreases the number of genetic differences between populations?.1 What decreases genetic variation in a population?.
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