The Analysis of Chromosome Movements, I

Podophyllum versipelle

抄録

1. Bivalents may fall to orientate themselves an the spindle at meiosis in Podophyllum versipelle; their centromeres then fail to show the special repulsion, which acts only in an axial direction.
2. At interphase the major spirals of the first division appear as relic spirals, which are gradually lost as the chromosomes spiralise for the second division. The degree of spiralisation varies in different nuclei.
3. Asymmetrical movement at the pollen grain anaphase results from stretching of the spindle when one group of chromosomes is obstructed by the wall. An acentric “chromatid-chromosome” was found to lag without dividing. The centromere therefore seems to control division in the resting stage as well as separation at anaphase.