which of the following are possible results of genetic drift? course hero

by Ms. Drew O'Connell Published 2 years ago Updated 1 year ago 9 min read

What is genetic drift Quizlet?

See Page 1. 11. Which of the following are the results of genetic drift? A. Loss of rare alleles, and can decrease the size of the gene pool. B. Loss of rare alleles, and can increase the size of the gene pool. C. Both A and B are most likely to happen D. None of these. 12.

Which types of large populations are most likely to experience genetic drift?

Genetic drift is the process by which random events cause random fluctuations in gene frequencies. Gene frequency is a measure of the proportion of available slots at a given locus that have a particular allele. A locus (plural, loci) is the physical location of a gene on a chromosome. An allele is a version of a gene.

Is genetic drift the only mechanism of evolution?

Mar 25, 2021 · 1. Genetic drift can do all of the following EXCEPT a. cause a population to be better adapted to its environment b. cause a change in allele frequencies in a population c. cause a change in the population average for a phenotype d. result in …

What are the effects of genetic drift in humans?

Nov 07, 2020 · Changing population size doesn’t allow genetic drift to happen so easily. In smaller populations, genetic drift happens over a smaller amount of generations – this is evident for a population of 60. For a population of 200, the frequencies of colors fluctuated for longer, but it was still affected by genetic drift after hundreds of generations. With a population, there is a …

Which of the following are possible results of genetic drift?

Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool. 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.

What are two types of extreme genetic drift?

There are two major types of genetic drift: population bottlenecks and the founder effect. A population bottleneck is when a population's size becomes very small very quickly. This is usually due to a catastrophic environmental event, hunting a species to near extinction, or habitat destruction.Sep 7, 2021

What is genetic drift a change in allele frequencies caused by random events?

Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events. To be more exact, genetic drift is change due to "sampling error" in selecting the alleles for the next generation from the gene pool of the current generation.

Can genetic drift eventually lead to speciation?

Genetic drift can facilitate speciation (creation of a new species) by allowing the accumulation of non-adaptive mutations that can facilitate population subdivision.

What are the effects of genetic drift Class 12?

Two types of effects of genetic drift are known – the bottleneck effect and the founder effect. In the founder effect, a small group of individuals breaks off from a larger population to form a new colony.

What are the results of natural selection?

Through this process of natural selection, favorable traits are transmitted through generations. Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species. It is one of the processes that drives evolution and helps to explain the diversity of life on Earth.Oct 24, 2019

What are the 3 causes of genetic drift?

Genetic drift can be caused by a number of chance phenomena, such as differential number of offspring left by different members of a population so that certain genes increase or decrease in number over generations independent of selection, sudden immigration or emigration of individuals in a population changing gene ...

What is genetic drift in genetics?

Genetic drift is a mechanism of evolution characterized by random fluctuations in the frequency of a particular version of a gene (allele) in a population.

What is genetic drift Class 10?

Genetic drift is an evolutionary change in allelic frequencies of a population as a matter of chance. It occurs in very small populations but its effects are strong. It occurs due to an error in selecting the alleles for the next generation from the gene pool of the current generation.

What results in populations that change due to genetic drift quizlet?

Natural selection and genetic drift both result in a change in the frequency of alleles in a population, so both are mechanisms of evolution. ... Genetic drift causes evolution by random chance due to sampling error, whereas natural selection causes evolution on the basis of fitness.

What type of speciation is genetic drift?

A second process called genetic drift describes random fluctuations in allele frequencies in populations, which can eventually cause a population of organisms to be genetically distinct from its original population and result in the formation of a new species.

What are some examples of genetic drift?

Genetic Drift Examples

In the population, the different alleles that create coat color are equally distributed. A disease comes into the rabbit population and kills 98 of the rabbits. The only rabbits that are left are red and grey rabbits, simply by chance. The genes have thus “drifted” from 6 alleles to only 2.

How does genetic drift affect evolution?

Other processes, such as genetic drift, can cause a change in gene frequency between generations . Genetic drift is the process by which random events cause random fluctuations in gene frequencies . Gene frequency is a measure of the proportion of available slots at a given locus that have a particular allele. A locus (plural, loci) is the physical location of a gene on a chromosome. An allele is a version of a gene. Random fluctuations in gene frequency can occur through chance alone. Certain individuals may reproduce more than others through sheer luck. These changes are not related to fitness or adaptation, including traits that improve survival or reproduction in a particular environment.

What happens when a bottleneck occurs?

A bottleneck event causes a rapid decline in genetic variation. This means the members of the population become more genetically similar to each other. Surviving organisms have traits not selected for. Rather, these organisms survive due to random chance.

How does genetic drift affect a population?

Genetic drift does not take into account an allele’s adaptive value to a population, and it may result in loss of a beneficial allele or fixation (rise to frequency) of a harmful allele in a population.

What is genetic drift?

Genetic drift occur s in all populations of non-infinite size, but its effects are strongest in small populations. Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to frequency, of other alleles. Genetic drift can have major effects when a population is sharply reduced in size by ...

What is bottleneck effect?

The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a population, killing most individuals and leaving behind a small, random assortment of survivors.

Does genetic drift take into account alleles?

Genetic drift, unlike natural selection, does not take into account an allele’s benefit (or harm) to the individual that carries it. That is, a beneficial allele may be lost, or a slightly harmful allele may become fixed, purely by chance.

What is the founder effect?

The founder effect and the bottleneck effect are cases in which a small population is formed from a larger population. These “sampled” populations often do not represent the genetic diversity of the original population, and their small size means they may experience strong drift for generations.