Unusual Mechanisms of Chromosome Pairing in Arthropoda
The development of serial sectioning and three-dimensional reconstruction techniques and their application to the study of spermatocyte nuclei at prophase (Wettstein and Sotelo 1967) introduced a new perspective to previous morphological studies. Several authors applied a cytogenetical approach to ultrastructural studies, leading to a better knowledge of meiotic chromosome zones and to a complete analysis of pachytene chromosome complement of several species. The application of these concepts to the study of the ultrastructure of mammalian sex chromosomes allowed the establishment of a structural and behavioural pattern (especially through the extensive work performed by Solari). Both differentially condensed sex chromosomes present axial structures during meiotic prophase and pair their common ends, forming a short SC segment while the free ends vary in their morphological characteristics from species to species.
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