Singh B N, Pandey M B
Department of Zoology, Banaras Hindu University, Varanasi, India.
Indian J Exp Biol. 1994 Jul;32(7):482-5.
Mating success between purple eye colour mutant and wild type D. biarmipes was observed in Elens-Wattiaux mating chamber. Multiple-, female-, male- and no-choice techniques were used. The values of isolation estimate in different experiments are above one which provides no evidence for preferential mating between females and males of the same type. The comparison of sexual behaviour of mutant and wild flies clearly indicates that wild type males are more successful in mating than mutant males, and mutant females are more receptive than wild type females. Thus purple eye colour mutation affects mating propensity of both sexes in D. biarmipes. However, the difference in the number of matings of wild and mutant flies is highly significant in multipe- and no-choice experiments in which sex-ratio was 1:1 (equal number of males and females). But the difference is not significant when mating success was scored by female- and male-choice methods in which sex-ratio was 1:2 (one female and two males; one male:two females). Thus it is suggested that mating propensity in D. biarmipes is influenced by sex-ratio.
在埃伦斯 - 瓦蒂奥克斯交配室中观察了紫眼颜色突变体与野生型双叉果蝇之间的交配成功率。采用了多次选择、雌性选择、雄性选择和无选择技术。不同实验中的隔离估计值均高于1，这表明没有证据支持同一类型的雌性和雄性之间存在优先交配现象。突变果蝇和野生果蝇性行为的比较清楚地表明，野生型雄性在交配方面比突变型雄性更成功，而突变型雌性比野生型雌性更易接受交配。因此，紫眼颜色突变影响了双叉果蝇两性的交配倾向。然而，在性别比例为1:1（雄性和雌性数量相等）的多次选择和无选择实验中，野生果蝇和突变果蝇的交配次数差异非常显著。但当通过雌性选择和雄性选择方法记录交配成功率时（性别比例为1:2，即一只雌性和两只雄性；一只雄性和两只雌性），差异并不显著。因此，有人认为双叉果蝇的交配倾向受性别比例影响。
