Quantitative genetics of sperm precedence in Drosophila melanogaster.
Quantitative genetics of sperm precedence in Drosophila melanogaster.
复制标题
果蝇精子优先的数量遗传学。
DOI：
10.1093/genetics/145.1.139
复制
发表时间：
1997
期刊：
影响因子：
3.3
通讯作者：
Hughes,KA
中科院分区：
文献类型：
--
作者：
Hughes,KA
为了评估精子竞争的遗传基础的条件下，它发生，我估计添加剂，显性，纯合子和环境方差分量，近交的影响，和分离等位基因的两个措施的精子优先在一个大的，远交的实验室人口的加权平均优势。第一和第二雄性优先级在近亲繁殖中均显着下降。第二雄性优先表现出显着的显性方差和纯合遗传方差，但加性方差很低，与零无显着差异。对于第一雄性优先，纯合品系之间的方差也是显著的，显性方差大于加性方差，但在统计学上不显著。与此相反，雄性交配成功和其他健身组件在果蝇一般表现出显着的加性方差和很少或没有显性方差。其他最近的实验表明，精子优先的显着基因型变异，并将其与副腺蛋白的等位基因变体。在数量遗传变异结构中，精子优先与其他雄性适合度性状的差异表明，这些性状的变异维持可能有不同的机制。本实验中显示的遗传变异和近亲繁殖下降的模式表明，一个或几个对精子优先有主要影响的基因可能在这个群体中分离。
To assess the genetic basis of sperm competition under conditions in which it occurs, I estimated additive, dominance, homozygous and environmental variance components, the effects of inbreeding, and the weighted average dominance of segregating alleles for two measures of sperm precedence in a large, outbred laboratory population. Both first and second male precedence show significant decline on inbreeding. Second male precedence demonstrates significant dominance variance and homozygous genetic variance, but the additive variance is low and not significantly different from zero. For first male precedence, the variance among homozygous lines is again significant, and dominance variance is larger than the additive variance, but is not statistically significant. In contrast, male mating success and other fitness components in Drosophila generally exhibit significant additive variance and little or no dominance variance. Other recent experiments have shown significant genotypic variation for sperm precedence and have associated it with allelic variants of accessory-gland proteins. The contrast between sperm precedence and other male fitness traits in the structure of quantitative genetic variation suggests that different mechanisms maybe responsible for the maintenance of variation in these traits. The pattern of genetic variation and inbreeding decline shown in this experiment suggests that one or a few genes with major effects on sperm precedence may be segregating in this population.