Camacho J P M, Cabrero J, López-León M D, Bakkali M, Perfectti F
Departamento de Genética, Universidad de Granada, 18071 Granada, Spain.
Genetica. 2003 Jan;117(1):77-84. doi: 10.1023/a:1022311320394.
The grasshopper Eyprepocnemis plorans harbours an extremely widespread polymorphism for supernumerary (B) chromosomes, which is found in almost all circum-Mediterranean and Caucasian populations hitherto analysed. B chromosomes in this species have been shown to evolve through several stages of parasitic and near-neutral nature, presumably because of an arms race between the standard (A) and B chromosomes. This intragenomic conflict can either be solved with the extinction of the neutralised B chromosome or, more interestingly, with the replacement of the neutralised B by a mutant version being parasitic again and thus prolonging B chromosome life. This species thus provides a complete view of the long-term life-cycle of parasitic B chromosomes.
蚱蜢Eyprepocnemis plorans拥有一种极其广泛的多余（B）染色体多态性，在迄今为止分析的几乎所有环地中海和高加索种群中都能发现。该物种的B染色体已被证明经历了几个寄生和近中性性质的进化阶段，大概是由于标准（A）染色体和B染色体之间的军备竞赛。这种基因组内的冲突要么通过被中和的B染色体的灭绝来解决，要么更有趣的是，通过被中和的B被一个再次具有寄生性的突变版本所取代，从而延长B染色体的寿命来解决。因此，该物种提供了寄生B染色体长期生命周期的完整图景。
