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A population of finches became isolated on an island - Scottish Highers Biology - Question 18 - 2018
Question 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 popul... show full transcript
Worked Solution & Example Answer:A population of finches became isolated on an island - Scottish Highers Biology - Question 18 - 2018
Step 1
Selection Pressure and Speciation
Answer
In this scenario, the beak size of the finches is influenced primarily by stabilising selection pressure, which favors intermediate traits. As generations pass, this leads to allopatric speciation due to the geographical isolation of the population on the island. Therefore, the correct row from the table is C, indicating stabilising selection and allopatric speciation.