Selection and the ''sex-ratio'' polymorphism in natural populations of Drosophila pseudoobscura
Selection and the ''sex-ratio'' polymorphism in natural populations of Drosophila pseudoobscura
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DOI：
10.2307/2410851
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发表时间：
1996-04-01
期刊：
影响因子：
3.3
通讯作者：
Beckenbach, AT
中科院分区：
文献类型：
--
作者：
Beckenbach, AT
“性别比例”(SR) 是一种自然发生的 X 连锁减数分裂驱动系统，其中 SR-X 染色体被传递给几乎所有 SR 雄性的后代。在某些伪暗果蝇种群中，这种现象的发生频率高达 25%。由于双重驱动优势，SR 应该在种群中迅速固定，导致物种灭绝，除非受到强选择的反对。我检查了成年体健康的几个组成部分，包括亚利桑那州东南部两个果蝇种群的所有基因型交配组合的频率、生育力和繁殖力。在图森种群中观察到 SR/SR 雌性的繁殖力显着下降。与标准雄性相比，没有发现任何证据表明 SR 雄性的生育能力较低或交配成功率较低。大多数反对 SR 的选择似乎在自然界的幼虫阶段起作用。
''Sex-ratio'' (SR) is a naturally occurring X-linked meiotic drive system, where the SR-X chromosome is transmitted to nearly all progeny of SR males. It occurs at frequencies of up to 25% in some populations of Drosophila pseudoobscura. Because of the twofold drive advantage, SR should rapidly fix in populations, causing the extinction of the species, unless opposed by strong selection. I examine several of the adult components of fitness, including the frequencies of all genotypic mating combinations, fertilities, and fecundities of flies from two populations in southeastern Arizona. Significant reduction of fecundity of SR/SR females was observed in the Tucson population. No evidence was found for either lower fertility or reduced mating success of SR males, relative to standard males. Most selection opposing SR appears to be operating at the larval stages in nature.