Abstract
The Anaphase-I behaviour of univalents produced by desynapsis has been studied in four inbred lines of rye. — The analyses show that the distribution of numbers of equationally dividing univalents per cell at anaphase-I does not conform to the statistical expectation of randomness. The pattern of this distribution leads us to the assumption that two types of univalent pairs are present at metaphase I: in type I both members of the pair can divide equationally or reductionally, independent of one another. In type II both members of the pair always divide reductionally. Under this assumption a theoretical model was made which fits the observed distribution of the number of equationally dividing univalents per cell. — It is suggested that the difference of anaphase-I behaviour between these two types of univalent pairs is determined by the moment of metaphase I at which they are formed.
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