How does gene flow affect allele frequencies quizlet?

How does gene flow affect allele frequencies?

In humans gene flow usually comes about through the actual migration of human populations, either voluntary or forced. Although gene flow does not change allele frequencies for a species as a whole, it can alter allele frequencies in local populations.

How can gene flow result in changes in allele frequencies quizlet?

Gene flow can cause changes in allele frequency through influx of new individuals. Nonrandom mating influences phenotypes through assortive mating and sexual selection. Genetic drift is the result of chance variations in allele frequencies which may be caused by the bottleneck effect or the founder effect.

How does gene flow affect genes?

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.

How does genetic drift affect allele frequencies in a population quizlet?

As genetic drift increases, population size decreases. … When a population is founded by a small number of individuals, it is likely that chance alone (genetic drift) will cause the allele frequencies in the new population to be different from the source populations.

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How does gene flow cause variation?

High gene flow in a pathogen increases the size of the population and of the geographical area in which its genetic material occurs. Therefore, pathogens that show a high level of gene flow generally have greater genetic diversity than pathogens that show a low level of gene flow.

What can cause allele frequencies to change in populations quizlet?

Allele frequencies may change when gene flow occurs, because arriving individuals introduce alleles to their new population and departing individuals remove alleles from their old population.

What effect does gene flow have on population variation quizlet?

Gene flow tends to reduce genetic differences between populations. If it is extensive enough, gene flow can eventually mix neighboring populations into a single population with a common gene pool.

What process describes changes in allele frequencies in a population quizlet?

Genetic drift is defined as any change in allele frequencies in a population that is due to chance. The process is aptly named, because it causes allele frequencies to drift up and down randomly over time. … Drift occurs in every population, in every generation.

How does gene flow affect neighboring populations?

Gene flow occurs when individuals join new populations and reproduce. Gene flow keeps neighboring populations similar. Low gene flow increases the chance that two populations will evolve into different species.

What are the disadvantages of gene flow?

On the one hand, gene flow between selective environments can increase the frequency of locally maladapted genotypes, which might decrease fitness and thereby have negative consequences for population growth and persistence, i.e. migrational meltdown (Kirkpatrick & Barton 1997; Boulding & Hay 2001; Ronce & Kirkpatrick …

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