An earthquake decimates a wolf population, killing 95% of th…
An earthquake decimates a wolf population, killing 95% of the wolves. The surviving population happens to have smaller teeth, on average, than the initial population. If teeth size is genetically determined, what effect has the wolf population experienced during the earthquake?
Read DetailsThree-spined mosquitofish show substantial heritable variati…
Three-spined mosquitofish show substantial heritable variation in gill-whisker length related to differences in their diets. Longer gill-whiskers are better for capturing open-water prey, while shorter gill-whiskers are better for capturing shallow-water prey. Medium size gill-whiskers struggle with capturing all types of prey.Which of the following types of selection would occur in a large lake with a high density of these fish if both long and short gill-whiskers are favored?
Read DetailsWhich of the following is the correct sequence of events und…
Which of the following is the correct sequence of events under the influence of natural selection with genetic variation in the population? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship.
Read Details