膜翅目昆虫补偿性性别决定机制

膜翅目昆虫单双倍体性别决定机制(雄性是单倍体、雌性是二倍体)在昆虫纲的进化中有非常重要的作用。通常膜翅目昆虫的性别由单一位点的等位基因决定,杂合体发育成雌性,半合体发育成雄性。在近亲繁殖的情况下,一定数目的雄性会出现纯合二倍体,由于遗传阻隔这种二倍体的雄性通常是不育的。csd基因的发现为膜翅目昆虫性别决定机制提供了分子生物学证据。文章探讨CSD的分子生物学基础,对膜翅目昆虫sl-CSD的分布进行综述并且探讨膜翅目昆虫降低二倍体雄性消耗的策略以及可能存在的进化机制,最后提出几点建议以便从遗传学、生态学以及进化生物学角度全面的了解sl-CSD。

Complementary sex determination analysis in Hymenoptera

The haplodiploid sex determination mechanism in Hymenoptera(males are haploid,while females are diploid)plays an important role in the evolution of this insect order.The sex of hymenopterous insects is determined by a single locus.Females are usually heterozygous and males hemizygous.Under inbreeding conditions,homozygous diploid and sterile males occur,which forms a genetic burden on a population.The discovery of csd gene in honeybees may offer a molecular basis for further understanding of complementary sex determination.In this paper,we discuss about the molecular basis,taxonomic distribution of sl-CSD,and the mechanisms.