![]() ![]() Selective pressures will work in the advantage of the longer neck giraffes and therefore the distribution of the trait within the population will shift towards the longer neck trait. Therefore when looking at a distribution of traits in a population, a graph tends to lean more to one side:Įxample: Giraffes with the longest necks are able to reach more leaves to each. This type of natural selection occurs when selective pressures are working in favour of one extreme of a trait. Therefore, the plants that are a middle height between the two get both enough sunlight and protection from the wind. The plants that are very short fail to get enough sunlight to prosper. If we look at a distribution of traits in the population, it is noticeable that a standard distribution is followed:Įxample: For a plant, the plants that are very tall are exposed to more wind and are at risk of being blown over. ![]() ![]() This type of natural selection occurs when there are selective pressures working against two extremes of a trait and therefore the intermediate or “middle” trait is selected for. These types include the following: Stabilizing Selection When it comes to natural selection, there are three different types of selection that can occur. For organisms to evolve, there needs to be differences in traits between organisms that provide certain advantages or disadvantages, and it is these traits that natural selection acts upon. The process of natural selection is important and is a driving force for evolution. The theory of natural selection was first founded by Charles Darwin. Natural selection is defined as a process or a “force” that allows for organisms better adapted to their environment to better survive and produce more offspring. ![]()
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