caa a22 4500 477089194 CHVBK 20180405111511.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF02254948 doi (NATIONALLICENCE)springer-10.1007/BF02254948 Chiasma localization, heterochromatin and synaptonemal complexes in the grasshopper Pyrgomorpha conica [Elektronische Daten] [A. del Cerro, A. Fernández, J. Santos] Surface-spread synaptonemal complexes and chiasma distributions in spermatocytes with different C-banding patterns and chiasma distributions in oocytes were analyzed in the grasshopperPyrgomorpha conica. Male meiosis was characterized by a proximal/distal chiasma localization and complete pairing of homologous chromosomes at pachytene. However, there were indications of a relationship between the frequency and location of pairing initiation sites and chiasma distribution. The presence of a proximal supernumerary segment in a medium-sized chromosome does not increase the mean cell chiasma frequency of carrier individuals compared with those lacking it but may modify chiasma distribution in at least some carrier bivalents. This effect could be related to heterosynapsis in the region near the segment. Mean cell chiasma frequency was significantly lower in females than in males. Females also showed altered chiasma distributions compared with males, with fewer proximal chiasmata and more interstitial and distal chiasmata. Rapid Science Publishers, 1996 chiasma localization nationallicence grasshopper nationallicence heterochromatin nationallicence sex nationallicence synaptonemal nationallicence complexes nationallicence del Cerro A. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut Fernández A. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut Santos J. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut Chromosome Research Kluwer Academic Publishers 4/1(1996-01-01), 69-76 0967-3849 4:1<69 1996 4 10577 https://doi.org/10.1007/BF02254948 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02254948 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- del Cerro A. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Fernández A. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Santos J. Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040, Madrid, Spain aut NATIONALLICENCE 773 0- Chromosome Research Kluwer Academic Publishers 4/1(1996-01-01), 69-76 0967-3849 4:1<69 1996 4 10577 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer