title: Why do chloroplasts and mitochondria contain so many copies of their genome?
mesh_terms: D002736:Chloroplasts / Q000032:analysis*; D004247:DNA / Q000032:analysis*; D004272:DNA, Mitochondrial / Q000032:analysis*; D005796:Genes; D008928:Mitochondria / Q000032:analysis*; D012335:RNA, Ribosomal / Q000235:genetics*; D013045:Species Specificity
chemical_list: D004272:DNA, Mitochondrial; D012335:RNA, Ribosomal; D004247:DNA