Consider a species that has continental and remote island populations. Gene flow occurs between continental and island populations, but the magnitude of gene flow from continent to island is much greater than the magnitude of gene flow from island to continent. Why?
Gene flow is the movement of individuals or gametes from one population to another, due to migration and movement gametes through different carriers such as wind, insects and birds. This is one of the factors that drive microevolution.
Answer and Explanation:
The magnitude or extent of gene flow between continental populations (mainland populations) and island populations differ because of difference in amount of its inhabitants and resources. Diverse species and larger populations are found in mainland compared to island, thus during migration, large continental populations can reach island populations. Although remote islands house species and populations of unique traits due to isolation, the population is small because of small land area and limited resources. This is why the magnitude of gene flow from island populations to continental populations is less.
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Learn more about this topic:
from High School Biology: Homework Help ResourceChapter 14 / Lesson 12