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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.
What else can I help you with?
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.
Does natural selection exist?
Of course!
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 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.
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...
How did humans come to exist according to Darwin?
They evolved by a process of natural selection.
How do organisms evolve through natural selection?
Organisms evolve through natural selection by the process of differential survival and reproduction of individuals with advantageous traits. Variations exist within a population, and those that are better adapted to their environment are more likely to survive and pass on their genes to the next generation. Over time, these advantageous traits become more common in the population, leading to evolutionary change.
What is the radiant evolution in Darwin's theory?
The concept of "radiant evolution" does not exist in Darwin's theory of evolution by natural selection. Darwin's theory emphasizes the process of natural selection acting on heritable traits within a population, leading to changes in the frequency of traits over generations. This process results in the gradual adaptation of organisms to their environments.
What is a natural variation in a population?
Look at a population of humans. Your class will do. Now, how many different heights, hair colors and other assorted phenotypic variations can you see in this small population?This is the frequency of alleles of these types that we call natural variation.
What happens in natural selection when living things face many challenges in the struggle to exist?
In this scenario, individuals with traits that help them better adapt to the challenges have a higher chance of survival and reproduction. Over time, these advantageous traits become more common in the population through the process of natural selection, leading to a better fit between the organisms and their environment.
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.
