Sexual Selection and Natural Selection

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Selection is the functional relationship between phenotypes and fitness. Natural selection is the production of organisms according to their physical attributes whereby off springs of the younger generations takes the strong, desired and inheritable aspects of their parents. They become more adapted to the environment although some does well than others according to their individual traits which are attributed to their phenotypes (Sinervo, 1997). According to Charles Darwin, fitness can be described in three different forms of selection which interferes with the mean of phenotypic traits in a population. They include: directional selection; stabilizing selection; and destructive selection.

Directional selection in the long term can lead to formation of new organisms from the existing one because the traits are linearly related to fitness. Stabilizing selection on the other hand leads to refinement of the existing type by eliminating the extremes in a distribution of phenotypes. The third selection trait, destructive selection, can lead to formation of two new types of species from...
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