4. A new species forms because of the formation of a mountain that divides one population into

two. What type of speciation is this?

5. The bell curve in polygenic traits is becoming narrower over time. What type of selection is

occurring?

6. What are the five conditions impacting the Hardy-Weinberg equilibrium?

7. How does natural selection impact single-gene traits?

8. What does the allele frequency have to total in the Hardy-Weinberg equilibrium?

ION K

This is allopatric speciation. This is an example of stabilizing selection in a population because the organisms in the middle of the population have the best fitness for their environment. The five conditions impacting this equilibrium are: mutations, nonrandom mating, genetic drift, migration, and natural selection. Natural selection impacts single-gene traits because of the possible extinction of one trait or increase of another trait. If a trait is found to be not preferable in that environment, it could be eliminated through natural selection. The total allele frequency in the Hardy-Weinberg equilibrium has to equal 1.