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What else can I help you with?
What are four forces that can change the frequency of genes in a population?
- natural selection - sexual selection - genetic drift - immigration/emagration
Can someone help you compare and contrast natural selection and evolution any help would be great?
Evolution is simply genetic change within a poulation. That change can occur in several ways. One is immigration/emigration: individuals moving in or out of a population bring in or take out their alleles with them. Another is genetic drift, or chance events which cause the frequencies of alleles in a population to fluctuate. New mutations can change the allelic frequency as well. Finally, natural selection can cause some alleles to become more common at the expense of others. In short, natural selection is one of several mechanisms that can bring about evolution.
Evolutionists often make the distinction between evolution as a fact and evolutionary theory What does this mean?
Evolution is descent with modification. Or, change over time. And formally as the change in allele frequencies over time in a population of organisms. This is an observed and a observable fact. The theory is; the theory of evolution by natural selection, which explains the fact of evolution. Natural selection is the main mechanism ( there are others ) that drives the adaptive change in organism that can lead to speciation, or just simple evolution.
Which of the following is the most powerful evolutionary force in large populations over time?
Only natural selection could be the answer here as natural selection is the main driver of adaptive change leading to evolutionary change and speciation in large populations.
How does natural selection lead to evolution of a population?
In its simplest definition, evolution is the change of allele frequencies within a population over time. There are two main ways an allele can change in frequency: # Natural selection-- alleles that are beneficial will rise in frequency due to natural selection, while those that are detrimental will fall in frequency (and even be lost entirely) # Genetic Drift-- alleles can change in frequency from generation to generation due to chance factors, such as sampling error. It is the primary reason for frequency change in selectively neutral alleles. Very small populations are particularly prone to this kind of change, although all finite populations experience genetic drift to some degree.
When microevolution occurs what kind of frequencies change?
allele
How do allele frequencies remain constant while genotype frequencies evolve over time?
Allele frequencies remain constant in a population when certain conditions are met, such as no mutations, no gene flow, random mating, a large population size, and no natural selection. Genotype frequencies can change over time due to factors like genetic drift, natural selection, and non-random mating. As long as the conditions for constant allele frequencies are maintained, the overall genetic makeup of the population remains stable even as individual genotypes may change.
How can under natural conditions cause allele frequencies to change?
Under natural conditions, allele frequencies can change due to various factors such as genetic drift, gene flow, natural selection, mutation, and non-random mating. These mechanisms can lead to changes in the distribution of alleles within a population over time.
How do allele frequencies change in Hardy-Weinberg equilibrium?
In Hardy-Weinberg equilibrium, allele frequencies remain constant from generation to generation if certain conditions are met. These conditions include no mutation, no gene flow, random mating, a large population size, and no natural selection. If these conditions are not met, allele frequencies can change due to factors such as genetic drift, gene flow, mutation, non-random mating, or natural selection.
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 type of natural selection causes no change in the population?
If a population exists in an environment that changes very little, then natural selection may not provide any pressure to change. However, even under these conditions genetic driftoccurs, introducing random change within the parameters set by natural selection.
What are other evolutionary mechanisms besides natural selection?
Other evolutionary mechanisms besides natural selection include genetic drift, gene flow, mutation, and sexual selection. Genetic drift is the random change in allele frequencies in a population. Gene flow refers to the transfer of genes between populations. Mutation introduces new genetic variation, and sexual selection drives evolutionary change through mate choice and competition for mates.
What indicates that evolution is occurring in a population in genetic terms?
In terms of a population, evolution is just the change of allele frequencies over time. Natural selection can cause certain advantageous alleles to increase in frequency, and detrimental alleles to decrease in frequency.
Are new alleles made by natural selection?
No - natural selection does not create new alleles. Variation in alleles needs to exist in the population in order for natural selection to occur. Natural selection will involve the change in allele frequencies over time, but it does not create new alleles. New alleles are the result of mutations.
Why don't gene frequencies change from one generation to the next?
Gene frequencies may remain stable between generations due to factors such as random mating, large population size, absence of gene flow, absence of mutations, and absence of natural selection. When these factors are in play, genetic equilibrium is maintained, and gene frequencies do not change significantly from one generation to the next.
What can the theory of evolution by natural selection explain about a population?
How it can change in response to its enviroment
Under ideal conditions how do allele frequencies change over time?
Under ideal conditions, allele frequencies can change over time due to genetic drift, natural selection, gene flow, and mutations. These factors can cause certain alleles to become more or less common in a population, leading to changes in allele frequencies. Over many generations, these changes may result in evolution occurring within the population.
