page 13 18. A population of finches became isolated on an island. The graph shows the range of beak sizes within the initial population at the time of isolation and in the population after many generations. Increasing number of finches Key initial population population after many generations Increasing beak size Which row in the table shows the type of selection pressure and the type of speciation which might be expected to occur in this example? Selection pressure Speciation A directional allopatric B directional sympatric C stabilising allopatric D stabilising sympatric [Turn over