The relation of a particular chromosomal element to the development of the nucleoli in Zea mays

  title={The relation of a particular chromosomal element to the development of the nucleoli in Zea mays},
  author={B. Mcclintock},
  journal={Zeitschrift f{\"u}r Zellforschung und Mikroskopische Anatomie},
  • B. Mcclintock
  • Published 2004
  • Biology
  • Zeitschrift für Zellforschung und Mikroskopische Anatomie
Summary1.The nucleolus is organized in the telophase through the activity of a distinct deep-staining body having a definite position in one chromosome (the satellited chromosome) of the monoploid complement. Correlated with the number of satellited chromosomes present, the telophases of somatic tissue of haploids show one nucleolus, diploids, two nucleoli and triploids, three nucleoli. That the nucleolus develops through the activity of this body (refered to as the nucleolar-organizing body or… 

Placement of genes for ribosomal RNA within the nucleolar organizing body of Zea mays

The most important conclusion to be derived from these studies is that the vast majority, if not all, of the ribosomal-RNA genes are unambiguously located within the nucleolar organizing body [with possibly a small percentage of them in the adjacent achromatic gap].

A chromosome rearrangement in Neurospora that produces segmental aneuploid progeny containing only part of the nucleolus organizer

In translocation T(IL→VL)OY321 of Neurospora crassa a distal portion of the nucleolus organizer chromosome, including ribosomal DNA sequences and the nuclelus satellite, is interchanged with a long terminal segment of IL, suggesting chromosome inactivation.

The behavior of nucleolus organizers in structurally changed karyotypes of barley

Two standard karyotype barley lines and 18 lines with karyotypes reconstructed by means of induced reciprocal translocations have been studied with respect to nucleolus formation, finding that when NORs are translocated to chromosomes with no NOR in thestandard karyotyp, the normal pattern of nucleolUS formation remains unchanged.


Previously, it was shown that a fragment chromosome, apparently derived from the Nicotiana repanda chromosomal complement, restores to normal the morphology and fertility of the abortive and

A chromosome rearrangement in Neuvospora that produces viable progeny containing two nucleolus organizers

Ch Chromosomes and nucleoli have been examined during meiosis and postmeiotic nuclear divisions in the ascus, comparing heterozygous AR33 × N crosses with N × N and with crosses heterozygOUS for other interchanges.

The nucleolus organizer region of maize (Zea mays L.)

The heterochromatic segment of the NOR was found to contain most of the rRNA cistrons, but has little or no interaction with the nucleolus, but is active in nucleolar formation as viewed at pachytene, diakinesis and quartet stages.

Nucleoli and chromosomes: Their relationships during the meiotic prophase of the human fetal oocyte

The number of nucleoli and the relations between them and chromosomes in the human fetal oöcyte have been investigated and the opinion that there are multiple sites for the synthesis of the various nucleolar componnents is supported.

The genetic control of nucleolus formation in wheat

There is a frequently, but not invariably, seen correlation between rRNA gene number and nucleolus size, however the relative size of theucleolus formed depends principally upon the proportion of the total active rRNA genes in the cell which are localised at the nucleolUS organiser in question.

The nucleolus organizer region of maize (Zea mays L.): Chromosomal site of DNA complementary to ribosomal RNA

A maize genetic marker strain was found to carry a cytologically-visible “duplication” of the nucleolar organizer region (NOR), and the chromosomal site of DNA complementary to rRNA was shown to be localized in the NOR, the first report on the localization of rDNA cistrons in theNOR of plants.

Nucleolus size variation during meiosis and NOR activity of a B chromosome in the grasshopper Eyprepocnemis plorans

The number of nucleoli and nucleolar area were measured in meiotic cells from males of the grasshopper Eyprepocnemis plorans collected in three natural populations and B chromosomes as stress-causing genome parasites and the nucleolus as a sensor of stress were discussed.



The association of non-homologous parts of chromosomes in the mid-prophase of meiosis in zea mays

  • B. Mcclintock
  • Biology
    Zeitschrift für Zellforschung und Mikroskopische Anatomie
  • 2006
In many cases, the non-homologous association at pachytene appears to be as intimate as homologueous association, andTranslocations probably result from the association of non-Homologous parts of chromosomes.


The chromosomes in the eggs of Fundulus can be traced from the metaphase of one cell generation through all the stages of mitosis and interkinesis as continuous structures which give rise to the


For the purpose of comparison of the behavior of the nucleoli, and the relation of the latter to the chromosomes and the satellites, somatic mitoses were studied of the plants possessing entirely different idiograms but belonging to the same family.

The Morphology of the Chromosomes of Pisum sativum

The chromonemata of the first meiotic metaphase and the chromosomes of later stages are found to show the Same individual characteristics as the somatic chromosomes.

Somatic segregation together with alteration of the chromosomal complement and of the nucleolar composition

  • W. E. Mol
  • Biology
    Zeitschrift für Induktive Abstammungs- und Vererbungslehre
  • 2005
The supposed enzymatic nature of the nucleolus and the significance of the division into two inequal par ts are discussed.

Die somatische Heteropyknose bei Drosophila melanogaster und ihre genetische Bedeutung

  • E. Heitz
  • Biology
    Zeitschrift für Zellforschung und Mikroskopische Anatomie
  • 2004
I n h a l t s v e r z e i e h n i s . soite I. Analyse der Chromosomen yon Drosophila melanogaster . . . . . . . . 237 A. Die Kerns t ruk tur . . . . . . . . . . . . . . . . . . . . . . . 237 B. Die

A Correlation of Cytological and Genetical Crossing-Over in Zea Mays.

  • H. CreightonB. Mcclintock
  • Biology, Medicine
    Proceedings of the National Academy of Sciences of the United States of America
  • 1931
In this paper, McClintock and Creighton conclusively demonstrated the occurrence of genetic and cytological crossingover, a process assumed but not proven since 1910. In it they took two genetic

Interchange between X- and Y-Chromosomes in Attached X Females of Drosophila Melanogaster.

  • B. Kaufmann
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1933
The present cytological study was undertaken to compare the structure of detached X's with that of normal X-chromosomes.

Cytologische und embryologische Untersuchungen an Drimiopsis maculata Lindl

  • Paul Baranov
  • Biology
    Zeitschrift für Zellforschung und Mikroskopische Anatomie
  • 2004
Drimiopsis maculata besitzt von allen bis jetzt untersuchten Liliaceen die größte Chromosomenzahl und werden weder bei der Entwicklung of Macrosporen noch in somatischen Zellen beobachtet.

Nukleolen und Chromosomen in der Gattung Vicia

Zusammenfassung1.33Vicia-Arten werden auf das Vorhandensein von Trabantenchromosomen untersucht. Sie finden sich bei allen in der Zwei- oder Vierzahl. Etwa 26 dieser Arten sind allein durch ihr