Final answer:
Natural selection encompasses various processes that influence the evolution of species and their diversity. Disruptive selection, directional selection, and stabilizing selection are key types of natural selection, each leading to different outcomes in evolution. Understanding these types can help clarify how species adapt and how new species arise.
Explanation:
Naturally Selected Types of Selection
Natural selection is a key mechanism of evolution, influencing how species adapt and evolve over time. Different types of natural selection have distinct impacts on species and their diversity.
- Results in the evolution of the species: This is generally seen with both directional selection and disruptive selection, as both can lead to adaptations that significantly change a species over time.
- Results in new species: This typically refers to disruptive selection, where extreme traits are favored, leading to speciation as populations diverge.
- Favors traits at the two extremes: This describes disruptive selection, which selects for extreme phenotypes at both ends of the spectrum while selecting against intermediate traits.
- No increase in diversity: This occurs with stabilizing selection, which favors average phenotypes and reduces variation by eliminating extremes.
- One extreme trait is favored: This indicates directional selection, where one extreme phenotype is favored over others, leading to a shift in the population towards that trait.
- Diversity decreases: This is commonly seen in stabilizing selection, which narrows the range of phenotypes in a population.
- Diversity increases: This can occur with disruptive selection as it promotes the survival of multiple extreme variations within a population.
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