Abstract
The ultrastructure of moving amphitelic sex chromosomes during anaphase of the first meiotic division of spermatocytes was studied by means of serial sections. The chromosomes have radial lamellae-like projections at their surface running in the direction of the spindle axis. Parallel spindle microtubules lie between these lamellae. The kinetochoral region pointing to the interzone (KIZ) is stretched, while the kinetochore pointing polewards (Kp) is flat. It is suggested that the importance of the poleward kinetochore as an application site for pulling forces during anaphase movement is possibly reduced in favour of the lamellaemicrotubule association at the periphery of the chromosome. Distal parts of kinetochoral tubules of KIZ may be associated with the lamellae of the partner sex chromosome. This arrangement may have some additional importance for the synchronization of sex chromosome migration in anaphase.
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