Electronic Resource
Springer
Archives of microbiology
19 (1953), S. 267-286
ISSN:
1432-072X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary 1. Unorthodox methods of approach appear to be responsible for the radical divergences in views regarding the identification of the various organelles in a budding yeast cell. 2. The problems of yeast cytology are analysed, and the necessity to distinguish the cytological behaviour of an aerobically growing culture from an anaerobic one is emphasized. 3. Photomicrographic proof for mitosis is offered in a purely aerobic strain of yeast having a pair of unequal chromosomes. 4. The chromatin mass seen at early prophase resolves itself into the pair of unequal metaphase chromosomes. These reproduce and the mother cell and bud regularly receive an unequal pair. 5. Evidence for somatic pairing and synapsis is presented. The reconstitution of the nucleus in the telophase takes place by an exact reversal of the stages leading to the metaphase thus proving chromosome continuity. 6. The cytological behaviour of the rare spontaneous autotetraploids arising in normal diploid cultures is illustrated and their significance in genetic investigations discussed. 7. A pictographic summary of the mitotic cycle is given.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00410130
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