Tartof K D
Cell. 1979 Jul;17(3):607-14. doi: 10.1016/0092-8674(79)90268-x.
Examination of the ribosomal RNA (rRNA) gene of six sibling species that make up the D. melanogaster subgroup reveals that the nontranscribed spacer is highly conserved during evolution. Indeed, the spacer is at least as conserved as the transcribed rRNA sequence in four of the six species and only slightly less conserved in the others. These data support the hypothesis previously suggested (Tartof and Dawid, 1976) that selection has a significant role in maintaining the parallel evolution of genetically separate but homologous redundant gene clusters.
对构成黑腹果蝇亚组的六个姐妹物种的核糖体RNA（rRNA）基因进行检测发现，非转录间隔区在进化过程中高度保守。实际上，在六个物种中的四个物种里，该间隔区至少与转录的rRNA序列一样保守，在其他物种中保守程度仅略低。这些数据支持了先前提出的假说（塔尔托夫和达维德，1976年），即选择在维持遗传上分离但同源的冗余基因簇的平行进化中具有重要作用。
