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What must exist in a population before natural selection can act?
Wiki User
∙ 12y ago
Competition + Variation.
Classic example:
Giraffes not always had long necks. There were variation in the species. When food sauces grew low competition increases and those with longer necks survived (more fruit/food at the top of trees) as they were more suited to the conditions. These long necked giraffes then breed and the offspring have long necks, thus natural selection of a "fitter" species. Hense - survival of the fittest.
Wiki User
∙ 8y ago
Wiki User
∙ 14y agoCharles Darwin stated that three criteria must be satisfied for evolution by natural selection to occur.
- Genetic variation for some traits must exist within a population.
- Those traits must be at least partially heritable.
- Some variants must survive and reproduce at higher rates (natural selection.)
The result is that the distribution of that successful trait in the population will change over time.
Wiki User
∙ 12y agoWiki User
∙ 11y agoMutation and variation against an immediate environment.
Wiki User
∙ 14y agoSimply variation.
Addition
Without variation how can you have combination of different traits and therefore natural selection.
Wiki User
∙ 14y agogenetic variation among individuals
Wiki User
∙ 13y agoGenetic variation among individuals.
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Can natural selection exist with out evolution?
Perhaps not, but evolution can exist without natural selection.
What is a gene pool and how is it affected by natural selection?
A gene pool is the total number of genes of every individual in an interbreeding population. Which is like having every single gene of a population into one big pool (population).
How is folate linked to natural selection?
Folate doesn't exist. Why would you even look up this question on the internet?? Are you dumb! Go and look up the answer in the text like a good student!
What did Darwin assert in his book On The Origin of Species as the mechanism of evolution?
Due to genes and mutations, organisms show variation within a species. Changes in the environment can put a selective pressure on the species - certain mutations may be more beneficial, therefore more individuals with that mutation will exist, as they survive and breed. This process is called Natural Selection.
What would happen if there was no natural selection?
A hypothetical universe in which natural selection did not occur would - harbour no life, hence nothing for natural selection to act on, or - be different from the reality we know to such a degree that no meaningful statements can be made about it using terms applying to this reality. But, as an exercise of the mind, we'll consider just one possible (well, impossible, in our reality) scenario: think of an organism that replicates perfectly. It does not produce variation of any kind. Each offspring is an exact copy of the parent. Such a population, in a universe where such an organisms could exist, could grow, leading to an expanding population of exact replicas. Doesn't sound very exciting, does it? Okay, let's consider a second scenario, just for the heck of it. Think of a population of organisms replicating with variation, but where each variant (somehow, through strange perversions of known laws of physics) has the exact same chance of obtaining food and replicating. This might result in an expanding population with much genetic diversity, but each variant would be equally represented in the population gene pool. There'd be no distinct species, just a fine gradation of morphologies spread throughout the ecology. An ecology that, as mentioned above, would have the (physically impossible) capacity of providing an unlimited amount of everything they need to each of those critters. In other words, speculating about what life might look like without natural selection is interesting, but has no real applications, since such conditions could never occur in this universe.
Can natural selection exist with out evolution?
Perhaps not, but evolution can exist without natural selection.
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.
Does natural selection exist?
Of course!
Why is natural selection important for the animals?
Because all animals that exist have formed, and are being formed and re-formed, continuously, primarily by natural selection.
How did humans come to exist according to Darwin?
They evolved by a process of natural selection.
What happens in natural selection when living things face many challenges in the struggle to exist?
liveing things face many challenges in the struggle to exist
How does natural selection relate to randomness?
In all natural processes, there is an element of chance. In natural selection, most of that chance is introduced by the randomness of the genetic variations it works with. But other elements of chance exist as well. Natural selection is a stochastic phenomenon: not every less able variant will produce less offspring than the more able variant; much depends on chance environmental circumstances.
What species can evolve from natural selection?
Microevolution is merely evolution, the change in allele frequency over time in a population of organisms, and all animals do this all the time.Natural selection is always summing up the variation among a population of organisms and selecting those that show survivability and reproductive advantages, even is the selection does no more that stabilize the organisms phenotypes.Look to the evolutionary history of horses or whales to see clear examples of evolution and selection through time.
What did Darwin mean when he said that natural selection works on existing variation?
Natural selection is the differential reproductive success of genomic variation. But for differing variants to be able to compete reproductively, such variants must exist in the first place. Reproduction causes such variants to come into existence.
Do mutation evolution and natural selection apply to individuals or populations?
Since the natural selection is a theory, we can not apply a theory as a science. Even though some scientists believed in natural selection: think of Nazi scientists, Soviet scientists, etc. They were 100% evolutionist believers. Nobody yet seen atoms but we believe that they exist...strange. We apply faith in some modern science...hmmm...
Are mountains are natural resource?
yes, they are because they are natural things they already exist in the word before God created human beings
The similarities in the Galapagos finches implied?
The Galapagos finches only exist on the islands and inspired Charles Darwin. They implied that evolution occurs through natural selection.
