Selfish Genetic Elements Promote Polyandry in a Fly
Selfish Genetic Elements Promote Polyandry in a Fly
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DOI：
10.1126/science.1163766
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发表时间：
2008-11-21
期刊：
影响因子：
56.9
通讯作者：
Wedell, N.
中科院分区：
文献类型：
--
作者：
Price, T. A. R.;Hodgson, D. J.;Wedell, N.
目前尚不清楚为什么雌性与多只雄性交配，而交配成本往往很高，而且一次交配往往能提供足够的精子让雌性所有的卵子受精。一种可能性是，配种可以增加后代的体能，因为受精成功倾向于高体能男性的精子。我们发现，雌性果蝇在与携带有害的性别比扭曲基因的雄性果蝇交配的风险下，进化出更高的恢复率，这也降低了精子的竞争能力。由于降低精子竞争能力的自私遗传因素通常与低遗传适合度有关，它们可能是一夫多妻制进化的共同驱动力。
It is unknown why females mate with multiple males when mating is frequently costly and a single copulation often provides enough sperm to fertilize all a female's eggs. One possibility is that remating increases the fitness of offspring, because fertilization success is biased toward the sperm of high- fitness males. We show that female Drosophila pseudoobscura evolved increased remating rates when exposed to the risk of mating with males carrying a deleterious sex ratio- distorting gene that also reduces sperm competitive ability. Because selfish genetic elements that reduce sperm competitive ability are generally associated with low genetic fitness, they may represent a common driver of the evolution of polyandry.