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Natural selection doesn't directly occur in the genes or alleles. Natural selection occurs in the "real world", in which the organisms with the desirable traits are living, while the organisms with undesireable traits are dying or otherwise failing to reproduce. Nature is "selecting" these animals with useful traits, which survive to reproduce and pass on these genes.
The genes are what give animals the certain traits they need in order to survive. The individual alleles give the variation within a certain trait. For example, within the gene for fur color, there can be an allele for white, and an an allele for brown. The bunny that gets the brown allele will probably suvive in the wild. (Unless the environment is snow!)
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What role do alleles play in natural selection?
Genes are the medium by which inherited traits are passed on to offspring. It is inherited traits, and thus genes, that receive positive or negative selection.
What characteristic within populations cause natural selection to occur?
Genetic variation. If there were no variation in the genes/phenotype then natural selection would have nothing to select from.
What level does natural selection occur at?
natural selection occurs when animals need it
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 is the third step in natural selection?
There are really no steps in natural selection - just conditions required for it to occur.
What role do alleles play in natural selection?
Genes are the medium by which inherited traits are passed on to offspring. It is inherited traits, and thus genes, that receive positive or negative 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.
What characteristic within populations cause natural selection to occur?
Genetic variation. If there were no variation in the genes/phenotype then natural selection would have nothing to select from.
Why does recombination between linked genes continued to occur?
New allele combinations are acted upon by natural selection
What is a requirement for evolutionary changes to occur through natural selection?
Evolution occurs through natural selection via survival of the fittest. This means that those organisms that are most well adapted to the environment will survive and pass on their genes.
What does sex linked alleles mean?
Sex linked genes occur only on the X or the Y sex chromosomes.
Does natural selection occur in the world today?
Yes, natural selection is always occurring.
What level does natural selection occur at?
natural selection occurs when animals need it
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 is the third step in natural selection?
There are really no steps in natural selection - just conditions required for it to occur.
How may natural selection be able to cause evolution to occur?
By selecting the variant organism most suited to the environment the alleles of the population then change in frequency over time and thus evolution occurs.
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.
