THE CYTOLOGICAL BEHAVIOUR AND MODE OF TRANSMISSION OF ACCESSORY CHROMOSOMES IN PLANTAGO SERRARIA
Bibliographic record
Abstract
TABLE 1. Frequency of accessory chromosomes in a naturctl populcition of P. serraria from Portugal.No. 0 1 planls with respective 110. of ncc.Cllr.. 1 % plnnls with ncc.clir.295 G One plant was triploid.striiins studied by them, it seems a s if plants with accessory chromosomes :ire relatively common in the species. METHODSFor ordinary chromosome counts root-tips were fixed in chromeacetic-formalin, sectioned at 12 ,IL and stained with crystal violet.For :i more detailed study on the morphology of the chromosomes root-tips squiishes were used.hi this case the root-tips were pretreated with oxiquinolin, fixed in nietanol and propionic acid (3: 1) and stained with Feulgen and chrome .hematoxylin,according to MELANDER and WING-STRAND (1953).( h r valuable advice concerning the squashing technique I am indebted lo Dr. G. ~S T E R G R E N . )For the study of meiosis, sections a s well ns squashes have been used.For sectioning the buds were pretreated in metanol-propionic acid (3: 1) for 2 mins.and fixed in chrome-acetic-formalin.The squashes were made from fresh material a3 well as from buds fixed in nietanol-propionir acid, and in both cases they were stained in aceto-orcein.]:or the study of the transmission of the accessory chroniosonies, crosses were made by isolating the parental plants in isolation cages in the greenhouse.Plrrnttrgo serrcrritr is normally wind pollinated and the seed-setting ha\ generally been satisfactory.To obtain some information on the degree of self-fertilization one or two panicles of the parental plant were isolated in a pollen-proof bag.Generally these isolated panicles set only a few seeds.However, one plant set a large number of seeds on isolation and the cross in which this plant took part was therefore discarded. CYTOLOGICAL STUDIES 1. Mitosis'Hie size and shape of the five ordinary chromosomes of Plantago si>rrtrritt are illustrated in Fig. 1.Four of the chromosomes have a sub- 16015223, 1959, 2-3,
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".