THE KINETOCHORE OR SPINDLE FIBRE LOCUS IN AMPHIUMA TRIDACTYLUM

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Abstract
The kinetochore of univalent chromosomes is a compound body composed of a com-missural region and a spindle spherule. The half spindle component connects with the chromosome through the spindle spherule. In the 1st spermatocyte each tetrad has 2 kinetochores which are distinct and separate from each other, and each of the kinetochores is provided with 2 spindle spherules. The dyads as seen in the metaphase of the 2d spermatocytes show 1 kinetochore with a single spindle spherule in each of the 2 component chromatids. In the ensuing division these chro-matids go to opposite poles. The staining reactions of the kinetochore make it clear that it is not to be regarded as a chromomere in the ordinary sense.