Summary
Fritillaria Meleagris has chiasmata almost exclusively localised in the region of the attachment constriction.
Segments of the chromosomes are already split at leptotene.
At zygotene pairing occurs only along unsplit segments.
During pachytene the secondary split occurs in the paired segments, while the split halves of the unpaired segments become more clearly separated.
The observations are discussed in relation to observations of McClung and others on Orthoptera with localised chromosome pairing and to hypotheses on the mechanism of meiosis.
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Huskins, C.L., Smith, S.G. Chromosome division and pairing inFritillaria Meleagris: The mechanism of meiosis. Journ. of Genetics 28, 397–406 (1934). https://doi.org/10.1007/BF02981762
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DOI: https://doi.org/10.1007/BF02981762