[Answer] Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent species. What effect might natural selection have in this situation?

Answer: Natural selection might favor males with more distinctive calls and/or females that are more "choosy." As a result the reproductive barrier between the two species could be reinforced

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Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent species. What effect might natural selection have in this situation? Two bird species overlap in a hybrid zone . They are isolated by a slight difference in the male songs and by the females tendency to select males with the "correct " song . Hybrid offspring tend to have reduced fertility compared to either of the parent species . What effect should natural selection have in this situation ? Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent species. What effect might natural selection have in this situation ? Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent species. What effect might natural selection have in this situation ? Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent species. What effect might natural selection have in this situation ? Two bird species overlap in a hybrid zone . They are isolated by a slight difference in the male songs and by the fema...

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