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Expulsion of the sex chromosome from the spindle in spermatocytes of a Mantid

, : Expulsion of the sex chromosome from the spindle in spermatocytes of a Mantid. Chromosoma Wien, 4: 257-270

The primary spermatocyte of Humbertiella indica is characterized by expulsion of the X-chromosome from the developing spindle into the peripheral cytoplasm. Although a similar behavior is found in other XO organisms, the present case, by its exaggerated form, helps to determine causative factors. Expulsion is correlated with a delay in kinetochore-center inter-action; and it is suggested that, as a whole, variations in the timing of kinetochore activity may prove to be an important factor in detn. of chromosome arrangement. Ejection appears favored by a monopolar chromosome-fiber connection of the X in this sp., and by a cytoplasmic current in the equatorial zone of the cell, flowing outwards from the spindle.


DOI: 10.1007/bf00319479

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