NSF/Alfred P. Sloan Foundation Postdoctoral Research Fellowship in Molecular Evolution for FY 1997

DBI 9750051理查德·E·布劳顿这一行动为美国国家科学基金会/阿尔弗雷德·P·斯隆1997年分子进化博士后研究奖学金提供了资金。这些奖学金支持在有机体进化变化和适应的框架内，在分子水平上对生物模式和过程进行理论、比较、计算和/或实验分析的研究。这些研究还包括使用分子数据来解决更广泛的进化问题。每个研究金资助一项研究和培训计划，该计划将在一个赞助实验室进行。该奖学金的研究和培训计划名为“将多个基因座谱系应用于分子进化和物种分化”。这项研究的总体目标是了解自然种群中遗传变异的起源和维持。三种近缘关系密切的田野蟋蟀(Gryllus属)的五个核基因座正在生成基因谱系。一系列问题正在得到解决。来自不同基因座的基因树在结构和/或长度上有何不同？关于自然选择、重组、种群细分和种群大小波动的相对影响，不同的基因系统学表明了什么？两个同时杂交的物种在假设它们目前的分布之前，是在持续接触时还是在地理上隔绝的情况下出现分歧？

Abstract DBI 9750051 Richard E. Broughton This action funds an NSF/Alfred P. Sloan Postdoctoral Research Fellowship in Molecular Evolution for 1997. These fellowships support studies involving the theoretical, comparative, computational, and/or experimental analyses of biological patterns and processes at the molecular level within the framework of organismic evolutionary change and adaptation. These studies also include the use of molecular data to address broader evolutionary questions. Each fellowship supports a research and training plan to be carried out in a sponsoring laboratory. The research and training plan for this fellowship is entitled "Applying multiple locus genealogies to molecular evolution and species divergence." The overall goal of the research is to understand the origin and maintenance of genetic variation in natural populations. Gene genealogies are being generated from five nuclear loci for three closely related species of field crickets (genus Gryllus). A series of questions are being addressed. How do gene trees from different loci differ in structure and/or length? What do different gene phylogenies indicate about the relative effects of natural selection, recombination, population subdivision, and population size fluctuation? Did two concurrently hybridizing species diverge while in continuous contact, or in geographic isolation prior to assuming their present distributions?