Evolution of sexual isolation during secondary contact: Genotypic versus phenotypic changes in laboratory populations
Evolution of sexual isolation during secondary contact: Genotypic versus phenotypic changes in laboratory populations
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DOI：
10.1086/428388
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发表时间：
2005-04-01
影响因子：
2.9
通讯作者：
Wu, CI
中科院分区：
文献类型：
--
作者：
Alipaz, JA;Fang, S;Wu, CI
我们监测了实验室人群中两个行为种族接触时发生的表型和基因型变化。来自津巴布韦和附近地区的黑腹果蝇（Z型）与世界各地的果蝇（M型）相比表现出强烈但不对称的性隔离。当有其他选择时，Z雌性和M雄性的杂交不容易发生。已知至少有15个基因座控制Z型交配偏好和表现。通过在实验室种群中彻底混合这两种类型的基因组，我们人为地创造了最大的二次接触。尽管性选择的力量有利于Z型雄性性状，Z型行为是消除或大大减少在所有12个杂交群体后，只有60代。这一趋势与M型行为在全世界的传播以及对健身成分的详细分析是一致的。令人惊讶的是，与朝向M型的表型收敛相反，广泛覆盖映射的行为基因座的基因组区域的基因型样本没有显示出这样的趋势。基因组似乎是“细粒度的”，相邻的基因座具有不同的进化动力学和系谱历史。
We monitored the phenotypic and genotypic changes that occur when two behavioral races come into contact in laboratory populations. Drosophila melanogaster from Zimbabwe and nearby regions (Z type) show strong but asymmetric sexual isolation from their cosmopolitan counterparts ( M type). Crosses of Z females and M males do not take place readily when other choices are available. At least 15 loci are known to control Z-type mating preferences and performance. By thoroughly mixing the genomes of the two types in laboratory populations, we artificially created maximum secondary contact. Despite the strength of sexual selection favoring Z-type male characters, Z-type behavior is eliminated or greatly diminished in all 12 hybrid populations after only 60 generations. This trend is consistent with the spread of the M-type behavior throughout the world as well as a detailed analysis of fitness components. Surprisingly, in contrast with the phenotypic convergence toward the M-type, genotypic samples broadly covering the genomic regions of mapped behavioral loci show no such trend. The genome appears to be "fine grained," with adjacent loci having different evolutionary dynamics and genealogical histories.