Dowsett A P
Chromosoma. 1983;88(2):104-8. doi: 10.1007/BF00327329.
Very few of the middle repetitive DNA sequences found in Drosophila melanogaster are present in all of the species of the D. melanogaster subgroup. One member of the subgroup, D. erecta, lacks most of the families of repetitive elements from D. melanogaster (including copia and 412) but possesses many other families not present in the D. melanogaster genome. Other species in the subgroup possess some families in these two species and lack others. From this we conclude that most individual middle repetitive families are highly unstable components of the Drosophila genome over short periods of evolutionary time.
在黑腹果蝇中发现的中等重复DNA序列，只有极少数存在于黑腹果蝇亚组的所有物种中。该亚组的一个成员，直立果蝇，缺乏黑腹果蝇中大多数重复元件家族（包括copia和412），但拥有许多黑腹果蝇基因组中不存在的其他家族。该亚组中的其他物种在这两个物种中拥有一些家族，而缺乏其他家族。由此我们得出结论，在较短的进化时间内，大多数单个中等重复家族是果蝇基因组中高度不稳定的成分。
