Choose the correct sequence of evolutionary events in allopatric speciation III. Increased pre-mating reproductive isolation

Question

Choose the correct sequence of evolutionary events in allopatric speciation:

I. Geographical isolation

II. Ecological isolation

III. Increased pre-mating reproductive isolation

IV. Increased genetic divergence

V. Selection completed

1. A. III, IV, II, V
2. B. I, IV, II, V
3. C. II, III, IV, V
4. D. I, II, III, V (Correct answer)

Correct Answer

Option D — I, II, III, V

Detailed Solution & Explanation

The correct answer is I, II, III, V.

Key Points

• Allopatric speciation sequence: I (Geographic isolation) -> II (Ecological isolation as populations adapt differently) -> III (Pre-mating reproductive isolation develops) -> V (Selection completed, new species formed).
• Geographic divergence must come first.