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首页> 外文期刊>Canadian Journal of Zoology >Two karyotypes and heteromorphic sex chromosomes in Physalaemus petersi(Anura, Leptodactylidae)
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Two karyotypes and heteromorphic sex chromosomes in Physalaemus petersi(Anura, Leptodactylidae)

机译：子（Anura，Leptodactylidae）的两个核型和异型性染色体

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摘要

Cytogenetic analyses were performed on specimens from two populations of Physalaemus petersi from three locations in Brazilian West Amazon. Chromosomes from the testis and intestinal epithelium were stained conventionally with Giemsa or C-banded. All animals studied showed a full chromosome complement of 2n = 22, bur two distinct karyotypes (I and II) were detected among specimens from one of the populations. Karyotype I specimens showed a XX/XY sex chromosome system and C-band polymorphism. Bivalent chromosomes with heterozygous C-banding frequently lacked chiasmata in the region of this heterochromatin during the first meiotic division. The less common karyotype (II) had a heteromorphic pair of chromosomes, but the relationship of this pair to sex determination could not be elucidated because of the absence of female specimens. Karyotype II was observed in males whose call differed from those of other males in the same population, suggesting that a reevaluation of the taxon P. petersi may be necessary. These results suggest that, in these populations, karyological evolution occurs faster than anatomical evolution.
机译：对来自巴西西亚马逊地区三个地点的两个Physellaemus petersi种群的标本进行了细胞遗传学分析。睾丸和肠上皮的染色体通常用Giemsa染色或C带染色。所有研究的动物均显示2n = 22的完整染色体互补，在其中一个种群的标本中检测到bur两个不同的核型（I和II）。 I型核型标本显示XX / XY性染色体系统和C带多态性。在第一次减数分裂分裂过程中，具有杂合C带的二价染色体在该异染色质区域中经常缺乏Chiasmata。较不常见的核型（II）具有一对异型染色体，但是由于缺乏雌性标本，因此无法阐明该对与性别决定的关系。在同一群体中与其他雄性有别的雄性中观察到了核型II，这表明可能需要重新评估分类群P. petersi。这些结果表明，在这些人群中，核动力学进化比解剖学进化更快。

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