View changelog
| Phylum | Subphylum | Class | Subclass | Order | Family | Genus | Species | Anamorph |
|---|---|---|---|---|---|---|---|---|
| Ascomycota | Saccharomycotina | Saccharomycetes | Saccharomycetales | Saccharomycodaceae | Saccharomyces | cerevisiae |
Nuclear Division
Cell type: (ME) meiosis
Component: Nuc Div / SPB
| Characteristic | State | Code | Images |
|---|---|---|---|
| Centriole | absent | 0 | |
| Basic organization of the spindle pole | spindle pole body a plaque or disc | 3 |  |
| Spindle pole body form, interphase-prophase | a 7- to 9-layered disc | 4 | |
| Spindle pole body form, metaphase-anaphase | a 7-9-layered disc directly connected to spindle | 5 | |
| Spindle development site | gap in nuclear envelope | 0 | |
| Spindle pole body migration (per Heath, 1980, Int. Rev. Cytol. 64:1) | formation of adjacent fan-shaped arrays of microtubules that reorient during spindle formation | 2 | |
| Metaphase nuclear envelope | intact with small polar fenestrae plugged by the spindle pole bodies | 1 | |
| Perinuclear endoplasmic reticulum | absent | 0 | |
| Spindle vesicles | absent | 0 | |
| Central spindle | present | 1 | |
| Metaphase plate | absent | 0 | |
| Spindle pole body cap | absent | 0 | |
| Transient intranuclear element at late interphase-prophase | absent | 0 | |
| Sources | |
|---|---|
| Notes | Spindle pole bodies composed of 3-layered inner plaque, an intermediate space divided by an electron-dense intermediate line, and a layered outer plaque; Peterson et al. shows spindle pole body in nuclear membrane gap. |
| Character Quality | good |
| Fixation | gluteraldehyde with osmium postfix |
| Study Complete | no |
| Author | Moens, P.B. and Rapport, E. |
| Date | 1971 |
| Source | J. Cell Biol. 50: 344-361 |
| Other Sources | Peterson, J.B., Gray, R.H., and Ris, H. 1972. J. Cell Biol. 53:837-841 |
Cell type: (MI) mitosis
Component: Nuc Div / SPB
| Characteristic | State | Code | Images |
|---|---|---|---|
| Centriole | absent | 0 | |
| Basic organization of the spindle pole | spindle pole body a plaque or disc | 3 | |
| Spindle pole body form, interphase-prophase | a 7- to 9-layered disc | 4 | |
| Spindle pole body form, metaphase-anaphase | a 5-layered disc directly connected to spindle | 4 | |
| Metaphase nuclear envelope | intact with small polar fenestrae plugged by the spindle pole bodies | 1 | |
| Telophase nuclear envelope | retention of complete nuclear envelope around the chromatin with median constriction/fragmentation | 0 | |
| Spindle pole body cap | absent | 0 | |
| Transient intranuclear element at late interphase-prophase | absent | 0 | |
| Sources | |
|---|---|
| Notes | Spindle pole bodies composed of 3-layered inner plaque, an intermediate space divided by an electron-dense intermediate line, and a layered outer plaque. |
| Character Quality | good |
| Fixation | gluteraldehyde with osmium postfix |
| Study Complete | no |
| Author | Moens, P.B. and Rapport, E. |
| Date | 1971 |
| Source | J. Cell Biol. 50: 344-361 |