Accessory chromosomes.
D000220:Adaptation, Biological; D000818:Animals; D002843:Chromatin; D002869:Chromosome Aberrations; D002875:Chromosomes; D003434:Crossing Over, Genetic; D004463:Ecology; D005298:Fertility; D005838:Genotype; D006570:Heterochromatin; D006823:Hybrid Vigor; D007313:Insecta / Q000648:ultrastructure; D008322:Mammals; D008540:Meiosis; D008938:Mitosis; D010944:Plants / Q000648:ultrastructure*; D012434:Secale / Q000648:ultrastructure; D003313:Zea mays / Q000648:ultrastructure
D002843:Chromatin; D006570:Heterochromatin