Miller Gary T, Starmer William T, Pitnick Scott
Department of Biology, Syracuse University, 108 College Place, Syracuse, NY 13244-1270, USA.
Genet Res. 2003 Jun;81(3):213-20. doi: 10.1017/s0016672303006190.
In Drosophila, sperm length and the length of the females' primary sperm-storage organ have rapidly coevolved through post-copulatory sexual selection. This pattern is evident even among geographic populations of Drosophila mojavensis. To understand better these traits of potential importance for speciation, we performed quantitative genetic analysis of both seminal receptacle length and sperm length in two divergent populations. Parental strains, F1, F1 reciprocal (F1r), F2, F2r, backcross and backcross reciprocal generations were used in a line-cross (generation means) analysis. Seminal receptacle length is largely an autosomal additive trait, whereas additivity, dominance and epistasis all contributed to the means of sperm length. Either an X-chromosome or a Y-chromosome effect was necessary for models of sperm length to be significant. However, the overall contributions from the X and Y chromosomes to sperm length was small.
在果蝇中，精子长度与雌性主要精子储存器官的长度通过交配后的性选择迅速共同进化。这种模式在莫哈韦果蝇的地理种群中也很明显。为了更好地理解这些对物种形成可能具有重要意义的性状，我们对两个不同种群的受精囊长度和精子长度进行了数量遗传学分析。亲本菌株、F1、F1 反交（F1r）、F2、F2r、回交和回交反交世代用于系间杂交（世代均值）分析。受精囊长度在很大程度上是一个常染色体加性性状，而加性、显性和上位性都对精子长度的均值有贡献。精子长度模型要具有显著性，X 染色体或 Y 染色体效应是必要的。然而，X 和 Y 染色体对精子长度的总体贡献很小。
