Abstract

Genome studies of facultative sexual species, which can either reproduce sexually or asexually, are providing insight into the evolutionary consequences of mixed reproductive modes. It is currently unclear to what extent the evolutionary history of facultative sexuals’ genomes can be approximated by the standard coalescent, and if a coalescent effective population size Ne exists. Here, I determine if and when these approximations can be made. When sex is frequent (occurring at a frequency much greater than 1/N per reproduction per generation, for N the actual population size), the underlying genealogy can be approximated by the standard coalescent, with a coalescent Ne≈N. When sex is very rare (at frequency much lower than 1/N), approximations for the pairwise coalescent time can be obtained, which is strongly influenced by the frequencies of sex and mitotic gene conversion, rather than N. However, these terms do not translate into a coalescent Ne. These results are used to discuss the best sampling strategies for investigating the evolutionary history of facultative sexual species.

中文翻译：

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逼近兼性下的聚结

摘要

兼性有性物种的基因组研究，可以有性繁殖或无性繁殖，正在深入了解混合生殖模式的进化后果。目前尚不清楚兼性性别基因组的进化历史在多大程度上可以通过标准聚结来近似，以及是否存在聚结有效种群大小 Ne。在这里，我确定是否以及何时可以进行这些近似。当性别频繁时（发生频率远大于每代每次繁殖 1/N，对于 N 为实际种群大小），潜在家谱可以通过标准聚结来近似，聚结 Ne≈N。当性非常罕见（频率远低于 1/N）时，可以获得成对聚结时间的近似值，受性别和有丝分裂基因转换频率的强烈影响，而不是 N。但是，这些术语不会转化为合并的 Ne。这些结果用于讨论调查兼性有性物种进化史的最佳采样策略。