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What else can I help you with?
What type of selection is shown when the bell curve narrows over time?
Stabilizing selection, which acts against both extreme phenotypes and favors intermediate variants. Hence the narrowing of the bell curve in the middle.
How does environmental pressure affect natural selection?
When nothing happens to exert strong population pressure on that population, natural selection favors the allele frequency already present. When mutations cause new traits, natural selection weeds these traits out because they're not as efficient as the others.
Does natural selection favor the strong why or why not?
Right from the start, the terms "strong" and "favors" should be defined. Natural selection "favors" simply in that the mechanism allows the continuation of those who are better suited to their environment. "Strong" and "fittest" are synonymous in this regard, because it's not referring to physical strength. Natural selection only favors those who are able to survive long enough to reproduce and thus pass on their genes. That's all there really sis to it.
Which type of natural selection favors the average individual in a population?
That would be the Stabilizing Selection where there will me not a lot of genetic variation. The curve of the population allele frequency would be quite thin with the extreme being in the middle.
What does natural selection change the frequently of?
If there is a genetic mutation in an individual strong enough to modify there chance of survival it opens the door for natural selection. If the effect is positive they are more likely to outlive their original species. If it is negative it decreases their chance of outliving their original species. Also known as survival of the fittest it favors positive trays by "eliminating" negative ones.
When two extreme phenotypes are selected in natural selection the intermediate phenotypes become?
The intermediate phenotypes tend to be selected against, resulting in stabilizing selection that favors the extreme phenotypes. This can lead to a reduction in genetic variation within the population, as individuals with intermediate traits are less likely to survive and reproduce.
What is Stabilizing Selection and Distruptive selection?
Stabilizing selection is a type of natural selection that favors the intermediate phenotypes in a population, leading to a decrease in genetic diversity. Disruptive selection, on the other hand, favors extreme phenotypes over intermediate ones, resulting in increased genetic variation within a population.
What is Oscillating Selection?
favors different phenotypes at different times
What are the three patterns of of natural selection?
The three patterns of natural selection are directional selection, stabilizing selection, and disruptive selection. Directional selection favors individuals at one extreme of a trait distribution, stabilizing selection favors the intermediate phenotype, and disruptive selection favors individuals at both extremes of a trait distribution.
What type of selection is shown when the bell curve narrows over time?
Stabilizing selection, which acts against both extreme phenotypes and favors intermediate variants. Hence the narrowing of the bell curve in the middle.
In an unchanging environment selection in a well adapted population is?
In an unchanging environment, selection in a well-adapted population is stabilizing selection. This type of selection favors individuals with intermediate phenotypes, maintaining the status quo of the population's genetic characteristics.
What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Directional selection favors organisms with phenotypes at one extreme relative to the average phenotype. This occurs when individuals with traits at one end of a spectrum have higher fitness, leading to a shift in the population towards that extreme phenotype.
When natural selection favors the intermediate version of a characteristic it is called what?
It is called evolution. After all, all characteristics, as far as evolution is concerned, are intermediate. They're all temporary variants, on their way to becoming something else.
What does stabilizing selection do?
The average, distributed normally, trait in phenotype of a population is selected for. Take height in humans as an example. We have variation there, but there are too few ten foot humans and too few 2 foot hymans in the human population because natural selection in it's stabilizing form makes such height extremes reproductively unsuccessful in all earth's immediate environments.
How do directional selections and stabilizing selection differ and do they tend to increase or decrease diversity?
Well, Directional Selections and Stabilizing selections are different because in Directional Selection, the frequency of a particular trait moves in one direction in a range, while in Stabilizing Selection, the distribution becomes narrower, tending to "stabilize" the average by increasing the proportion of similar individual. Also, I'm not sure about this but I think the continued gene flow tends to decrease the diversity between populations.
What are the 3 ways natural selection can affect a population?
Natural selection changes the genetic makeup of a population by favoring some genotypes over others. It does so through the differential reproduction of those genotypes. Put simply, if I possess a variant of a trait (and the genotype underlying it) which allows me to leave behind more adult offspring than those with different variants of that trait, then my variant will become more common in the population than the others. The result is a change in the frequency of the gene variants: mine increases in frequency at the expense of the others. This change in the frequency of gene variants (known as alleles) over time in a population is the basic definition of evolution itself.
What is the natural selection favors the intermediate version of a characteristic it is called?
It is called evolution. After all, all characteristics, as far as evolution is concerned, are intermediate. They're all temporary variants, on their way to becoming something else.
