草鱼×赤眼鳟F_1 与其亲本遗传性状的比较研究

Comparison of Genetic Characteristics between the F_1 Hybrid (Ctenopharyngodon idella×Squaliobarbus cursiculus) and its Parents

采用生物统计方法，对草鱼、赤眼鳟及其杂种一代（草♀×赤♂、草♂×赤♀）的１０ 个数量性状进行统计分析，结果显示草♂×赤♀杂种的性状表现了明显的趋父性遗传，而草♀×赤♂杂种则表现了明显的趋母性遗传．用杂种指数衡量，在所测量的７ 个性状中，有５ 个偏向草鱼，只有体长／体高和脊椎骨数２ 个性状偏向赤眼鳟．这表明草鱼与赤眼鳟的杂交后代（Ｆ１）数量性状遗传受草鱼遗传因子的影响较大．

Statistical analysis of ten quantitative characteristics of the F 1 Hybrid(C. idella×S. cursiculus)and its parents has been studied,the results showed that the characteris tics of cis cross Hybrid(C. idella♂×S. cursiculus♀)were closer to those of papernal,the characteristics of trans crossing off springs from female C. idella and male S. cursiculus were closer to those of maternal. Evaluated by hybrid index,five of the seven tested characters were closed to those in C. idella,only standard length divided by body depth and vertebrate were closer to those in S. cursiculus.From the above study,a conclusion is drawn that characteristics of the F 1 hybrids were much more affected by the genetic factors of C.idella.