Natural selection

 Natural selection is a process were individuals better suited to their environment survive and pass on their traits to offspring, in turn making the trait more popular.

In order for natural selection to take place there must be variation in genotype. Varied genotypes produce varied physical characteristics, making individuals distinguishable (Phenotype) this means some organisms are better /or worse adapted to their environment. Organisms that are better suited to their environment have higher percentage chance of survival, for example; in the artic circle a hare with white fur genotype is less likely to be eaten by predators, a hare with brown fur genotpye is more likely to be visible to predators therefore more likely to be eaten. White hares are able to survive and reproduce passing on the white fur allele to offsping. As time passes frequency of the advantageous allele increases in population and the disadvantage allele falls.