果蝇中的边际超显性。
Marginal overdominance in Drosophila.
作者信息
Wills C
出版信息
Genetics. 1975 Sep;81(1):177-89. doi: 10.1093/genetics/81.1.177.
A reanalysis of Drosophila viability data was undertaken to determine the role of genotype-environment interactions in the maintenance of polymorphism. Between-replicate variances of viabilities in chromosomal homozygotes and heterozygotes with the same mean fitnesses were compared, with the expectation that if the heterozygote variance were on the average greater, conditional overdominance would be prevalent; if it were less, partial dominance would be prevalent; and if it were the same, marginal overdominance of the type considered by Wallace (1968) would be the prevalent type of variation. In fact, heterozygote variance was slightly less. The work of Dempster (1955) and of Gillespie and Langley (1974) is cited to show that this situation can still lead to balanced polymorphisms. Their general model for genetic variation in populations, consistent with the viability data, is reinforced.
对果蝇生存力数据进行了重新分析，以确定基因型 - 环境相互作用在维持多态性中的作用。比较了具有相同平均适合度的染色体纯合子和杂合子生存力的重复间方差，预期如果杂合子方差平均更大，条件超显性将普遍存在；如果更小，部分显性将普遍存在；如果相同，华莱士（1968年）所考虑的那种边际超显性将是普遍的变异类型。事实上，杂合子方差略小。引用了邓普斯特（1955年）以及吉莱斯皮和兰利（1974年）的研究成果来表明这种情况仍可导致平衡多态性。他们与生存力数据一致的群体遗传变异通用模型得到了加强。
Zotero 插件