Summary
The two arms of a bivalent can be bound (contain at least one chiasma) or not-bound (contain no chiasma). Formulae are presented to test the randomness of distribution of the bound arms over the chromosome complement, under the assumption that the probability of being bound is related to the arm length.
Testing meiotic configurations in Secale cereale (rye), Crotalaria intermedia and several species of Coffea, non-randomness was found in all cases, resulting in an excess of bivalents with only one arm bound. The effect is slightly different in the different plants. The basis is considered to be localization of chiasmata.
In rye plants, homozygous for a rather large translocation, an excess of univalents was observed to more than compensate the localization effect. This is attributed to the limited probability of the newly formed short arm of the small translocation chromosome to be bound.
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The section on rye was started at the Laboratory of Genetics, director Prof. Dr. R. Prakken, Agricultural University, Wageningen, Netherlands. It was completed, with the addition of the sections on Crotalaria and coffee, at the Inter-American Institute of Agricultural Sciences, Turrialba, C. R.
Cytogeneticist, Nuclear Energy Program, Inter-American Institute of Agricultural Sciences, Turrialba, Costa Rica, AEC Contract AT (30-1) 2043.
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Sybenga, J. Non-random distribution of chiasmata in rye, Crotalaria and coffee. Chromosoma 11, 441–455 (1960). https://doi.org/10.1007/BF00328666
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DOI: https://doi.org/10.1007/BF00328666