Compare the Types of Selection Seen in Medium Ground Finch

Essay

Compare the types of selection seen in medium ground finch beak size in the Galápagos Islands after the drought of 1977, in Australian snake gape width after the introduction of the cane toad, and in gall size produced by gallflies after selection by predatory birds and parasitoid wasps. For each scenario, draw a figure illustrating the type of selection acting on the population (draw the distribution of phenotypes in the population before and after selection). Indicate whether the selection is directional, stabilizing, or disruptive.