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How Changes in Population Lead to the Formation of

Natural selection worksheet illustrating directional, disruptive, and stabilizing selection through body‐size vs. population graphs. Includes questions on comparing variables and identifying selection types from the models.

Daniel Miller
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Selection and SpeciationHow can changes in a population result in the formation of a new species?Why?JHave vou ever wondered how the great diversity of life on Earth has come about or how a single newspecies forms? Environmental pressures may cause populations to change overtime or evolve. This isbecause an organism's abilitv to live to adulthood in its current environment will determine itsreproductive success and abilitv to pass on its genes. But changes withm a population can occur withoutcreating a new species. At what point do scientists start thinking of a new name for a species?Model 1 - Three Types of SelectionDirccuMid SdcuionDiirupuvt SefcciMMiS a i i h E i riri I faiL-* l i l u d *iMi -hii,.’ 1- 5■- -;■i : <,n| r»& MW1.What variables do die graphs in Model 1 com]Bodr sise and number of people.2.What are die three types of selection illustrated in the graphs in Model 1?Directional., disruptive. and intermediate.Selection and SpeciationHow can changes in a population result in the formation of a new species?Why?JHave vou ever wondered how the great diversity of life on Earth has come about or how a single newspecies forms? Environmental pressures may cause populations to change overtime or evolve. This isbecause an organism's abilitv to live to adulthood in its current environment will determine itsreproductive success and abilitv to pass on its genes. But changes withm a population can occur withoutcreating a new species. At what point do scientists start thinking of a new name for a species?Model 1 - Three Types of SelectionDirccuMid SdcuionDiirupuvt SefcciMMiS a i i h E i riri I faiL-* l i l u d *iMi -hii,.’ 1- 5■- -;■i : <,n| r»& MW1.What variables do die graphs in Model 1 com]Bodr sise and number of people.2.What are die three types of selection illustrated in the graphs in Model 1?Directional., disruptive. and intermediate.

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Biology

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