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Sex chromosomes behavior and G-banding treatment of male meiosis in nuptial gift-giving spiders of the family Trechaleidae

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Integrative Zoology 2011年第1期6卷 56-62页

作者： Maria J.ALBO Alicia POSTIGLIONI Laboratory of Ethology Ecology and EvolutionClemente Estable Biological Research InstituteMontevideoUruguay Department of Genetics and Animal Breeding Faculty of VeterinaryUniversity of the RepublicMontevideoUruguay

Preliminary genetic studies in Trechaleidae spider family show high variation in sex chromosomes and high heterocigocity,suggesting high chromatin *** trechaleids Paratrechalea ornata,Trechalea bucculenta and Trechaleoides biocellata are present in *** offering nuptial gifts during courtship have been reported in *** and *** but not in *** gifts are an inherited trait probably highly affected by environmental factors,which play an important role in gene *** hypothesize that this trait could be associated with tissue-specific genes existing in *** investigate the male meiosis in these 3 species,their sex chromosome system and the effects of G-banding on their chromosomes,and elucidate genetic differences among *** stages of the 3 species were submitted to Giemsa-staining and G-banding *** observed a haploid number of n=11 in *** and n=13 in both *** and *** from the 3 species presented an X_(1)X_(2)0 sex chromosome system,which is suggested as ancestral in *** *** and ***,both sex chromosomes were together and aligned in parallel until the segregation during anaphase *** contrast to these species,sex chromosomes of *** usually remained distant from each other until diakinesis when they were observed associated in parallel *** G-bands were similar in *** and ***,and they both differed from those in *** special behavior of sex chromosomes in *** as well as the different G-banding pattern of this species suggests the existence of novel modifications in this species.

关键词： G-banding male meiosis neotropical spiders sex chromosomes Trechaleidae

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