Abstract
Spermatocytes from testis biopsies that were squashed and stained according to the differential staining method gave, according to preliminary observations of the sex complex in pachytene, structural details that displayed variations in appearance in conjunction with the stage of pachytene. The possibility is discussed that detailed studies of the sex vesicle in pachytene might eventually complement clinical diagnosis in males with sex chromosome aberrations. Studies of sex bivalents in diakinesis and early metaphase I showed that the association between the X and Y chromosomes is not terminal, as it was maintained by several workers earlier, but that the medial part of the long arm of the Y chromosome is associated with the distal part of the short arm of the X chromosome. This association was not a point association, but one that occurred between chromosome segments. As a consequence of this, it seems that the existence of homologous segments in the X and Y chromosomes is highly probable.
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