title: A quantitative study of chiasma terminalization in the grasshopper Chorthippus jucundus.
abstract: The possible existence of chiasma terminalization in the grasshopper Chorthippus jucundus was tested in four males by means of comparisons between chiasma locations at diplotene and metaphase I within L3, M4 and M5 bivalents. Diplotene cells were stained by a C-banding technique to recognize heterochromatic regions, especially the centromeric ones, whereas metaphase I cells were stained by a silver staining technique that visualizes a core-like structure that extends through each homologous chromosome. The core is very pronounced at kinetochores and forms cross-shaped configurations at chiasmata. No evidence of chiasma terminalization has been found.
authors.affiliation: Departamento de Genética, Facultad de Ciencias Biológicas, Universidad Complutense, Madrid, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Santos
authors.forename: G
authors.initials: G
authors.lastname: Ciprés
authors.forename: J R
authors.initials: JR
authors.lastname: Lacadena
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D003434:Crossing Over, Genetic; D005787:Gene Frequency; D006110:Grasshoppers / Q000235:genetics*; D008297:Male; D008540:Meiosis; D008677:Metaphase