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

  • Barbara McClintock


  1. 1.

    Association of chromosomes at pachytene in Zea mays is 2-by-2 whether or not the parts associated are homologous.

  2. 2.

    Evidence for non-homologous association of parts of chromosomes has been obtained from monoploids, diploids, monosomics, trisomics, deficiencies, inversions, translocations, ring-shaped chromosomes, “asynaptic” plants and so-called “B-type” chromosomes.

  3. 3.

    In many cases, the non-homologous association at pachytene appears to be as intimate as homologous association.

  4. 4.

    Non-homologous association, present at pachytene, rarely continues into diakinesis.

  5. 5.

    Translocations probably result from the association of non-homologous parts of chromosomes.



Normal Chromosome Spindle Fiber Univalent Chromosome Homologous Part Text Figure 
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Copyright information

© Springer-Verlag 1933

Authors and Affiliations

  • Barbara McClintock
    • 1
    • 2
  1. 1.University of MissouriMissouriUSA
  2. 2.California Institute of TechnologyCaliforniaUSA

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