Summary
1. The somatic chromosome complements of forms ofPaeonia show that there are variations in the morphology of the complements and that polyploidy occurs.
2. The average chiasma frequency at metaphase is low (1·3 per bivalent) and very little terminalisation occurs.
3. All but three of the possible types of multivalent association in a tetraploid were found and the reasons for these absences are discussed.
4. The significance of bivalent interlocking and its relation to bivalent orientation on the spindle is discussed.
5. Evidence of structural hybridity in the paeony chromosome complements is provided by the occurrence of configurations showing deficiencies, translocations, reduplications and inverted segments.
6. Certain critical configurations are described which cannot be adequately explained by the classical hypothesis of chiasma formation or its modifications, but are explicable by the neo-chiasmatype hypothesis.
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Dark, S.O.S. Meiosis in diploid and tetraploidPaeonia species. Journ. of Genetics 32, 353–372 (1936). https://doi.org/10.1007/BF02982520
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DOI: https://doi.org/10.1007/BF02982520