[Campbell Biology P.568] The 'WHAT IF?' section asks: 'Predict what might happen if gene flo... | Practice Question

The 'WHAT IF?' section asks: 'Predict what might happen if gene flow were re-established at step 3 in this process.' Based on the information in Figure 24.15 and the accompanying text, what would be the most likely outcome if gene flow resumed before significant divergence occurred at step 3?

  • A: The two populations would likely fuse back into a single, cohesive species, reversing the divergence process.
  • B: Reinforcement would occur, leading to the rapid strengthening of reproductive barriers.
  • C: The populations would remain distinct but exchange genes at a low rate, leading to stability.
  • D: New reproductive barriers would quickly form, leading to instant speciation.

Explanation

Step 3 describes a population beginning to diverge. If gene flow is re-established before significant divergence, the populations would likely merge back into a single gene pool, effectively reversing the speciation process, which aligns with the concept of 'Fusion' but at an earlier stage before full reproductive isolation.