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Does natural selection work on preexisting variation in a population?
Wiki User
∙ 9y ago
Natural selection does work on preexisting variations in a population. This is how the population was shaped to be the way that they currently are or were.
Wiki User
∙ 9y ago
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When part of a population becomes separated from the rest what often begins?
Natural selection
What are the different ways in which individuals with a particular trait may increase in a population?
different ways in which individuals with particular trait may increase are -if that particular trait provides them with some sort of support to undergo the circumstances they are found in, we can also call it natural selection -or due to any genetic drift, that is a natural calamity, also called a chance selection
How do populations benefit from individual adaptations?
because of natural selection
What is percent of natural increase in population in Brazil?
it hasn't been recorded up to date but as of 2008 the population was 191,971,506 :)
Calculate the natural increase in a country?
To calculate the natural increase of a population, you take the the countries' birth rate (number of live births per 1000 population per year) minus the countries' death rate (number of deaths per 1000 population per year) -- BR-DR
Is Natural selection a source of genetic variation in a population?
No, natural selection works on that genetic variation presented to it.
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Is it possible for a population to undergo natural selection?
No, there is no genetic variation upon which natural selection can operate.
Why would natural selection not occur in this poplutation?
What population? Perhaps you mean if there were no variation for natural selection to select from.
What requires natural selection to occur in a population?
genetic variation
Is natural selection the only force that drives biological evolution?
No. Natural selection requires reproductive variation to work on. Besides reproductive variation and natural selection, there are various forces, biochemical as well as population dynamical, that affect the allelic composition of a population.
Does natural selection work on a variation already present in a population?
Yes.
Why must a population have a genetic variation in order for natural selection to occur?
Without variation there is nothing to select from.
How does genetic variation support Natural Selection?
Genetic variation in itself does not 'support' natural selection: it is what natural selection acts upon.
Natural selection acts on variation by?
Natural selection acts on variation by picking out from a population's gene pool those that are more fit to survive. More variation leads to more natural selection. For example, currently endangered cheetas are found out to have less genetic variation than other animals. As a result, if a disatrouous event occured, there are no genes that could help the cheetas survived. Thus, natural selection prevent the cheetas from reproducing as a population and they become extinct.
Can natural selection act on a population with no variation traits?
The trait is the same for all organisms.
In order for evolution by natural selection to occur what has to happen?
There must be genetic variation, the variation must be heritable, and there must be differential reproduction (due to competition).
