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MITOSIS AND CYTOKINESIS IN THE CHLOROMONADOPHYCEAN ALGA GONYOSTOMUM SEMEN 1
Author(s) -
Heywood Peter
Publication year - 1974
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1974.tb02725.x
Subject(s) - telophase , cytokinesis , biology , mitosis , anaphase , interphase , microbiology and biotechnology , nucleolus , metaphase , prophase , midbody , chromatid , binucleated cells , cell division , meiosis , cytoplasm , genetics , cell cycle , chromosome , cell , chemistry , micronucleus test , micronucleus , organic chemistry , toxicity , gene
SUMMARY Mitosis and cytokinesis in Gonyostomum semen (Ehrenberg) Diesing have been investigated with the light microscope. During prophase nucleoli disappear and the chromatid structure of the chromosomes becomes apparent. Separation of chromatids at anaphase is accompanied by progressive fusion of the progeny chromosomes. This process continues into telophase by which stage the progeny nuclei consist of dense masses of chromatin with occasional chromosomes extending from their equatorial surfaces. By the end of telophase, nucleoli are reforming and the interphase nuclear morphology is reestablished. Mitosis is followed by cytokinesis, which is a relatively lengthy phase. In early cytokinesis the 2 interphase nuclei are present, and there is no indication of the forthcoming division of the cytoplasm. Later in cytokinesis a membrane is formed between the 2 nuclei. Final separation of the progeny individuals is accomplished by vigorous movements of swimming cells or, in the case of palmelloid cells, by the deposition of a mucilaginous layer.