Coyne J A, Berry A
Department of Ecology and Evolution, University of Chicago, IL 60637.
J Hered. 1994 May-Jun;85(3):224-7. doi: 10.1093/oxfordjournals.jhered.a111440.
Genetic analysis of the fourth chromosome of Drosophila simulans shows that it has no effect on either male or female fertility in hybrids with two sibling species, D. mauritiana and D. sechellia. The lack of effect holds even when the D. simulans chromosome is homozygous in a foreign genetic background. The absence of major fourth chromosome "sterility genes" in these hybridizations contrasts with the presence of a fourth-chromosome gene causing complete male sterility in hybrids of the more distantly related species D. melanogaster and D. simulans.
对拟果蝇第四号染色体的遗传分析表明，在与两个近缘物种——毛里求斯果蝇和塞舌尔果蝇杂交时，它对杂种的雄性或雌性育性均无影响。即便拟果蝇染色体在异源遗传背景中是纯合的，这种无影响的情况依然存在。在这些杂交中不存在主要的四号染色体“不育基因”，这与在亲缘关系更远的物种——黑腹果蝇和拟果蝇的杂种中存在一个导致完全雄性不育的四号染色体基因形成了对比。
