B chromosomes proved to be more frequent in males than females of the grasshopperEyprepocnemis plorans collected from the population in Jete (Granada, Spain) in 1992. The meiotic behaviour of the X and B univalents was analysed in a high number of 1B males collected from this population in 1991 and 1992, and in males from another population (Salobreña, Granada, Spain) for comparison. These two chromosomes showed a significant tendency to migrate to opposite poles in the Jete population, during the 2 years analysed, but separated randomly in the Salobreña population. Thus, sex differences in the B frequency in Jete seemed to be due to the non-random X-B segregation during male meiosis. The analysis of association patterns between the two univalents over several stages of the first meiotic division indicated a heterochromatic affinity rather than association by chiasmata because most X-B associations had resolved by metaphase I. The X and B chromosomes share two different DNA sequences, so that some associations during prophase I undoubtedly involve homologous DNA sequences. The frequency with which X and B migrated to opposite poles at anaphase I in Jete, however, did not show any significant dependence on previous association at zygotene, diplotene or metaphase I.
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accepted for publication by J. S. (Pat) Heslop-Harrison
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López-León, M.D., Cabrero, J. & Camacho, J.P.M. Achiasmate segregation of X and B univalents in males of the grasshopperEyprepocnemis plorans is independent of previous association. Chromosome Res 4, 43–48 (1996). https://doi.org/10.1007/BF02254944
- achiasmate segregation
- B chromosome
- Eyprepocnemis plorans
- preferential segregation