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Population bottlenecks occur when the size of a population is drastically reduced, either through extinction or because of separation.
When this occurs, it is reasonable to assume that the genetic cross-section of the remaining population is not identical to that of the original population. Not all individuals carry every allele present in the original population, so the remaining population will carry only a small portion of the original number of alleles.
This can cause what is known as the 'founder effect'.
A bottleneck can reduce genetic diversity by decreasing the population size, leading to a loss of alleles. This can increase the likelihood of genetic drift and limit the ability of the population to adapt to changing environments. It can also increase the frequency of deleterious alleles due to random fluctuations in the small population.
It greatly reduces the total population. This increases the effects of genetic drift on allele frequency.
It increases the frequency of alleles that improve a species' survival in a particular environment.
It causes the allele frequency to resemble that of the members of the population who first became separated from the rest of the species. (Study Island)
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The number of trout in a lake drops when the lake is polluted. The trout population increases but the allele frequency is different than it was before the pollution. What type of effect is this?
Apex . . bottleneck
Which is an example of genetic drift?
Allele frequencies change randomly each generation. APEX
A flood kills most of a population of ants that lives near a river. After the flood the ant population increases but its allele frequencies are different. What does this situation represent?
bottleneck (apex) [correct]
A flood kills most of the ants that live near a river. After the flood one population of ants grows rapidly but its allele frequencies are different from the frequencies before the flood. What does th?
The flood likely caused a genetic bottleneck, reducing the genetic diversity of the ant population. The rapid growth after the flood may have allowed new mutations to become more prominent, leading to changes in allele frequencies. This could result in a genetic drift or selection event.
What is genic drift?
Genetic drift is the random fluctuation of gene frequencies in a population due to chance events. It can lead to changes in the genetic makeup of a population over time, particularly in smaller populations.
The number of trout in a lake drops when the lake is polluted. The trout population increases but the allele frequency is different than it was before the pollution. What type of effect is this?
Apex . . bottleneck
Which is an example of genetic drift?
Allele frequencies change randomly each generation. APEX
A flood kills most of a population of ants that lives near a river. After the flood the ant population increases but its allele frequencies are different. What does this situation represent?
bottleneck (apex) [correct]
A flood kills most of the ants that live near a river. After the flood one population of ants grows rapidly but its allele frequencies are different from the frequencies before the flood. What does th?
The flood likely caused a genetic bottleneck, reducing the genetic diversity of the ant population. The rapid growth after the flood may have allowed new mutations to become more prominent, leading to changes in allele frequencies. This could result in a genetic drift or selection event.
The number of trout in a lake drops when the lake is polluted. The trout population later increases but the allele frequencies are different. What does this situation represent?
Answer this question… Genetic drift
What is genic drift?
Genetic drift is the random fluctuation of gene frequencies in a population due to chance events. It can lead to changes in the genetic makeup of a population over time, particularly in smaller populations.
A situation in which allele frequencies change as a result of the migration of a small subgroup of a population is know as the?
founder effect
A genetic change which can effect a species fitness?
evolution within a species. the allele frequencies in a gene pool of a population
Do Stable allele frequencies prevent microevolution?
No, stable allele frequencies do not prevent microevolution. Microevolution involves changes in allele frequencies within a population over time, even if those frequencies are stable for a period. Evolution can still occur through mechanisms such as genetic drift, selection, and gene flow, even if allele frequencies are temporarily stable.
What is the type of equilibrium that occurs when allele frequencies do not change?
The type of equilibrium where allele frequencies do not change is called Hardy-Weinberg equilibrium. This equilibrium occurs in an idealized population where certain assumptions are met, such as random mating, no mutation, no migration, no natural selection, and a large population size. In Hardy-Weinberg equilibrium, the genotype frequencies can be predicted using the allele frequencies.
What term is defined as the change in allele frequencies that occurs when a new population is established?
The term you're looking for is "founder effect." It refers to a situation where a small population establishes a new colony which might have different allele frequencies from the original population due to the limited genetic variation carried by the founders.
What effect does a bottleneck have on the allele frequency of a population?
A bottleneck can lead to a significant reduction in the genetic diversity of a population, causing certain alleles to be lost and others to become more common. This can increase the frequency of rare alleles and result in genetic drift, potentially leading to an increase in genetic diseases or reduced fitness in the population.
