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Selection and Speciation

Explore how environmental pressures drive evolution and speciation. Learn when population changes are significant enough for scientists to identify a new species.

Alice Edwards
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Selection and SpeciationElow can changes in a population result in the iormation of a new species?Why?__________________________________________I lave you ever wondered how the great diversity of life on E arth has come about or how a single new spe-cies forms? Environmental pressures may cause populations to change over time or evolve. This is becausean organism's ability to live to adulthood in its current environment will determine its reproductive suc-cess and ability to pass on its genes. But changes within a population can occur without creating a newspecies. Ar what point do scientists start thinking of a new name for a species?Model 1 - Three Types of SelectionDirectional SelectionDisruptive Selection0>0L(MI B1-101750r>V.yMl 61V75 U.V ]«■11I 2> 1>7.> IMJBody Size Jg>Body Sizt (g)Stabilizing SelectionNumber of IndividualsOrigitulpypuLtionIhipulanonafter selection02330751W12>lyOBody Sue fp)I. Whatvariables do the graphs in Model I compare?Body size2. What are the three types oE selection illustrated in the graphs in Model 1?Directional, Disruptive, StabilizingSelection and Speciation1

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Biology

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