Evolution by natural selection results in what?

Answer 1

Natural selection is the nonrandom survival and reproductive success of randomly varying organisms.

The organism that is selected leaves more alleles of his progeny in the populations gene pool and evolution is just the change of that allele frequency over time in populations.

Answer 2

Evolution simply means the change in a gene pool over time. This simple, small scale definition of evolution can not be reasonably argued against by a rational scientist. There is definite proof that change in a gene pool, even significant change, has occurred in that of bacterial life, especially pathogens. In ways probably due to the overuse of antibiotics causing a natural kill off of all but resistant strains, thus changing a gene pool, many pathogens have become resistant to a current antibiotic, which is one of the reasons that new and more potent ones often have to be developed. This principle is also noted in insect groups that may change predominate color/type/attributes when certain insecticides are used, causing the surviving gene pool to be resistant.

I think the main question still here is whether evolution was so large scale that whole very different species originated from another, or an even deeper one, whether we all originated from one creature. This alas, not even I can answer.

Answer 3

Natural Selection

In a population of organisms, a selection pressure favors the individuals whose characteristics are best-fit to survive it. Gradually, more and more of these individuals will live on and reproduce, while more and more of the others will die off (natural selection). Gradually, over millions of years, the gene pool of this ancestral species will change to that of these best-fit individuals, a process called adaptation.

To clarify, here's a hypothetical example. A population of beetles living on a rocky beach is composed of gray and yellow individuals. A species of bird new to this beach (selection pressure)appears and makes its home there. Its diet consists of beetles, so it targets the beetle population for its meals. However, the only individuals it can see are the yellow ones because the gray ones blend in with the rocky ground. As a result, fewer and fewer yellow ones are able to survive, reproduce, and generate more of their own kind, and the population becomes more and more gray. This survival of best-fit individuals is natural selection. Give it a few million years, and the yellow variety will be wiped out, while the gray variety will be thriving; a change in the gene pool has occurred (adaptation)

Answer 4

Evolution occurs because of natural selection. If a particular trait is advantageous, the individuals that possess that particular trait are more likely to survive and reproduce. My reproducing, this genetic trait becomes more popular in a population, thus increasing the prevalence of that gene in the gene pool. This results in an "evolution" of that population.

Answer 5

Evolution is the change in allele frequency over time in a population of organisms.

When an organism is naturally selected to survive and reproduce more of it's progeny than other organisms in the population it's alleles will be better represented in the many surviving offspring it has had and so the frequency of the populations alleles will change and evolution will occur.

Populations evolve, individuals are selected.

Answer 6

In the adaptation of populations to a specific environment.

Answer 7

Natural selection

Answer 8

1 2 3 and 4 -study island

Answer 9

adaptation