. Analysis of development. Embryology; Embryology. 106 Cellular Structure and Activity pole and remains outside the metaphase plate (Hvighes-Schrader, '43b). Congression into the metaphase plate thus seems to be accomplished by the chromosomal fibers. Through them the chromosome or bivalent becomes attached to opposite poles of the spindle and the tension on the chromosomal fibers moves the chromosomes until equi- librium is reached in the metaphase plate (cf. Schrader, '47). In living cells such a movement of chromosomes back and forth in the long axis of the spindle has often been described
. Analysis of development. Embryology; Embryology. 106 Cellular Structure and Activity pole and remains outside the metaphase plate (Hvighes-Schrader, '43b). Congression into the metaphase plate thus seems to be accomplished by the chromosomal fibers. Through them the chromosome or bivalent becomes attached to opposite poles of the spindle and the tension on the chromosomal fibers moves the chromosomes until equi- librium is reached in the metaphase plate (cf. Schrader, '47). In living cells such a movement of chromosomes back and forth in the long axis of the spindle has often been described and is easily seen in most films of dividing cells. The pre-metaphase stretch ob- served in spermatocytes of several insects SPINDLE LENGTH CHROMOSOME SEPARATION. pulsive forces can produce similar patterns, but tell us nothing about the forces involved in the spindle. Most likely a complex inter- action of chromosomal fibers, electrostatic charges on chromosomes, and intermolecular attraction between spindle micelles, tending to crowd out foreign bodies (Ostergren, '51), is responsible for the metaphase arrange- ment. Anaphase Movement. Of all the various aspects of mitosis hardly any has attracted the attention of cytologists more than the strikingly regular movement of chromo- somes at anaphase. For years it has been the subject of much speculation and some experi- SPINDLE LENGTH CHROMOSOME SEPARATION. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
