Which of the following evolutionary forces consistently results in adaptive change in allele frequencies in a population?

Selection (This is the only evolutionary force that consistently results in adaption. Mutation w/out selection and genetic drift are random processes that may lead to adaptive, maladaptive, or neural effects on populations.) … There is no evolutionary force that results in adaptive changes in allele frequencies.

What factors cause change in allele frequencies?

The Hardy-Weinberg equilibrium principle says that allele frequencies in a population will remain constant in the absence of the four factors that could change them. Those factors are natural selection, mutation, genetic drift, and migration (gene flow). In fact, we know they are probably always affecting populations.

What is the result of a change in the allele frequency of a gene pool?

The bottleneck effect results in a change of allele frequencies of a gene pool causing genetic drift. It occurs as a result of natural disasters (earthquakes or floods).

Which statement correctly describes the role of chance in evolution?

Which statement correctly describes the role of chance in evolution? The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism’s DNA. An allele that increases evolutionary fitness cannot be lost from a population by chance events.

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Which are two factors that change gene frequencies in a population?

Factors that disturb the natural equilibrium of gene frequencies include mutation, migration (or gene flow), random genetic drift, and natural selection. A mutation is a spontaneous change in the gene frequency that takes place in a population and occurs at a low rate.

What are three major factors that can cause changes in allele frequencies?

Three mechanisms can cause allele frequencies to change: natural selection, genetic drift (chance events that alter allele frequencies), and gene flow (the transfer of alleles between populations).

What is the frequency of the allele?

An allele frequency is calculated by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population.

What is genetic drift and an example?

Genetic drift is a change in the frequency of an allele within a population over time. … A population of rabbits can have brown fur and white fur with brown fur being the dominant allele. By random chance, the offspring may all be brown and this could reduce or eliminate the allele for white fur.

How does genetic drift affect allele frequencies?

The consequences of genetic drift are numerous. It leads to random changes in allele frequencies. Drift causes fixation of alleles through the loss of alleles or genotypes. Drift can lead to the fixation or loss of entire genotypes in clonal (asexual) organisms.

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