title: Cytological evidence for procentric synapsis of meiotic chromosomes in female Drosophila melanogaster. The behaviour of an extra Y chromosome.
mesh_terms: D000782:Aneuploidy; D000818:Animals; D002875:Chromosomes / Q000648:ultrastructure; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D008297:Male; D008540:Meiosis; D008854:Microscopy, Electron; D012730:Sex Chromosomes / Q000648:ultrastructure*; D014998:Y Chromosome / Q000648:ultrastructure*