title: The B-chromosome system of the grasshopper Melanoplus femur-rubrum.
mesh_terms: D000818:Animals; D002875:Chromosomes; D003434:Crossing Over, Genetic; D006110:Grasshoppers / Q000166:cytology*; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D008938:Mitosis; D011123:Polyploidy; D012730:Sex Chromosomes