Is Speciation Accompanied by Rapid Evolution? Insights from Comparing Reproductive and Nonreproductive Transcriptomes in Drosophila

Figure 2

Distribution of ratio of divergence between D. melanogaster-D. simulans versus D. yakuba-D. erecta. (a) Distribution of molecular-divergence log₂ (𝑑_𝑁1/𝑑_𝑁2) to divergence-time ratio log₂ (𝑇₁/𝑇₂), between D. melanogaster-D. simulans and D. yakuba-D. erecta. Colored circles represent 𝑑_𝑁 ratios, and gray circles represent 𝑑_𝑆 ratios. The upper limit of the clockwise category is given by the log₂ ratio of divergence times (6.5/8.1) and the lower limit by the log₂ ratio 4.3/12.7. (b) Relationship of 𝑑_𝑁 between D. melanogaster-D. simulans and D. yakuba-D. erecta. The regression lines for each rate categories are also plotted. (c) Relationship of 𝑑_𝑆 between D. melanogaster-D. simulans versus D. yakuba-D. erecta; color codes: red: accelerated, black: clock-like, green: slow-rate categories, and grey: 𝑑_𝑆 ratios.

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