caa a22 4500 477089305 CHVBK 20180405111512.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF02254944 doi (NATIONALLICENCE)springer-10.1007/BF02254944 Achiasmate segregation of X and B univalents in males of the grasshopper Eyprepocnemis plorans is independent of previous association [Elektronische Daten] [M. López-León, J. Cabrero, J. Camacho] 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. Rapid Science Publishers, 1996 achiasmate segregation nationallicence B chromosome nationallicence Eyprepocnemis plorans nationallicence heterologous nationallicence homologous nationallicence meiosis nationallicence preferential segregation nationallicence López-León M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Cabrero J. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Camacho J. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Chromosome Research Kluwer Academic Publishers 4/1(1996-01-01), 43-48 0967-3849 4:1<43 1996 4 10577 https://doi.org/10.1007/BF02254944 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02254944 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- López-León M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 700 1- Cabrero J. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 700 1- Camacho J. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 773 0- Chromosome Research Kluwer Academic Publishers 4/1(1996-01-01), 43-48 0967-3849 4:1<43 1996 4 10577 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer