title: The cytogenetic systems of grasshoppers and locusts. II. The origin and evolution of supernumerary segments.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002466:Cell Nucleolus; D002869:Chromosome Aberrations; D002875:Chromosomes; D003434:Crossing Over, Genetic; D006110:Grasshoppers; D006570:Heterochromatin; D006579:Heterozygote; D006720:Homozygote; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D008938:Mitosis; D011995:Recombination, Genetic; D012641:Selection, Genetic
chemical_list: D006570:Heterochromatin