Darwinulid Ostracods: Ancient Asexual Scandals or Scandalous Gossip?
Darwinulid Ostracods: Ancient Asexual Scandals or Scandalous Gossip?
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达尔文介形类：古代无性丑闻还是丑闻八卦？
DOI：
10.1007/978-90-481-2770-2_11
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发表时间：
2009
影响因子：
4.1
通讯作者：
K. Martens
中科院分区：
文献类型：
--
作者：
I. Schön;G. Rossetti;K. Martens
尽管对假定的古代无性恋者的研究可以帮助解决性的悖论，但大多数对这类群体的研究仍然集中在巩固他们的地位上。达尔文甲壳类动物存在的证据至今尚无定论。最近在一个单一物种中发现了雄性，但它们的功能不确定，而且它们的形态突出了将雄性地位错误地分配给一个单一的达尔文史蒂文森个体，目前是古代无性达尔文动物的最佳候选人。先前关于过去2亿年假定的雄性化石的记录已被否定。古代无性行为的遗传特征同样是不确定的：在达尔文生物中没有Meselson效应，但无论是存在还是不存在Meselson效应都不能提供支持或反对性行为的确凿证据。然而，似乎将通用基因型与强大的均质遗传机制（基因转换、DNA修复）结合起来，至少在一些达尔文物种中，可以抵消性别缺失的有害影响。
Whereas studies of putative ancient asexuals could help solve the paradox of sex, most research on such groups still focuses on consolidating their status. The evidence for the darwinulid ostracods is as yet inconclusive. Recent males have been found in a single species, but their functionality is uncertain and their morphology highlights the erroneous assignment of male status to a single individual of Darwinula stevensoni, presently the best candidate for an ancient asexual darwinulid. Previous records of putative fossil males for the past 200 million years have been rejected. Genetic signatures of ancient asexuality are equally inconclusive: there is no Meselson effect in the darwinulids, but neither the presence nor the absence of the Meselson effect does provide conclusive evidence for or against sex. However, it would seem that a combination of a general purpose genotype with powerful homogenising genetic mechanisms (gene conversion, DNA repair) could counter the deleterious effects of the absence of sex in at least a number of darwinulid species.
性的迹象：我们所知道的以及我们如何知道它。
影响因子：
16.8
作者：
Schurko,AndrewM;Neiman,Maurine;LogsdonJr,JohnM
通讯作者：
LogsdonJr,JohnM