Which of the following reasons best explains why separate populations of a given species are likely to vary genetically from one another?
A) population sizes are likely to differ
B) gene flow increases the similarity among nearby populations
C) environmental and weather conditions vary on a small scale
D) natural selection is the only evolutionary force that improves the match between a population and its environment

Question

Quizplus · Accepted Answer

Environmental and weather conditions vary on a small scale, leading to different selective pressures in different areas, which can cause genetic variation among populations.

Which of the Following Reasons Best Explains Why Separate Populations