Summary
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1.
Localisation of chiasmata occurs proximally inM andS bivalents ofFritillaria meleagris andS bivalents ofLilium species. It is distal and intermediate inLilium M bivalents.
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2.
The mean chiasma frequency is not proportionally higher inM bivalents than inS bivalents.
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3.
InFritillaria and to a lesser extent in Lilium the chromosomes are larger at metaphase in theEMC’s than in thePMC’s.
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4.
The variance/mean ratio is highest in the intermediate chiasma frequency range. Thus the high variances come as would be expected with intermediate pairing between completeness and extreme localisation.
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5.
In all species and under all condition the chiasma frequency is higher inEMC’s than inPMC’s. The distribution is also different. This may be due either to the larger nuclei or the slower development of theEMC.
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6.
There are two systems of recombination, one on the male, and the other on the female side within each species.
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Fogwill, M. Differences in crossing-over and chromosome size in the sex cells of Lilium and Fritillaria. Chromosoma 9, 493–504 (1957). https://doi.org/10.1007/BF02568089
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DOI: https://doi.org/10.1007/BF02568089