POPULATION GENETICS OF SEX-RATIO IN DROSPHILA PSEUDOOBSCURA
POPULATION GENETICS OF SEX-RATIO IN DROSPHILA PSEUDOOBSCURA
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DOI：
10.1038/hdy.1961.35
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发表时间：
1961-01-01
期刊：
影响因子：
3.8
通讯作者：
EDWARDS, AW
中科院分区：
文献类型：
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作者：
EDWARDS, AW
在d.p epseudobscura中，x连锁的“性别比例”导致携带该基因的雄性很少或没有儿子，但几乎是正常雄性生育女儿的两倍。在没有差异生存力的情况下，人们可能会期望它在种群中增加，直到没有雄性留下，然而平衡，基因频率高达30%，已经在自然种群中被发现。Wallace（1948）进行了一系列的实验来确定生存能力，并设置了一些种群笼来跟踪基因的进展。在这些笼子里，基因要么被消除，要么在实验结束时频率很低。Bennett（1958）提出了一个性别连锁位点的数学模型，并将其应用于Wallace的发现，但对他的模型的检查发现了一个错误，使其不适用于这种情况：他混淆了配子和基因型的生存能力，这一过程使他的一些发现无效。本文描述了一个更合适的模型，用于研究多态。结果表明，华莱士的生存力既不适合自然种群，也不适合他的实验种群，并为每种情况提出了新的生存力。
In D. pseudoobscura the X-linked condition "sex-ratio" causes males carrying it to produce few or no sons, but nearly twice as many daughters as are produced by normal males. In the absence of differential viability one might expect it to increase in a population until there were no males left, yet equilibria, with gene frequencies up to 30%, have been found in natural populations. Wallace (1948) conducted a series of experiments to determine the viabilities, and set up some population cages to follow the progress of the gene. In these cages the gene was either eliminated, or was at a very low frequency when the experiment was ended. Bennett (1958) put forward a mathematical model for a sex-linked locus which he applied to Wallace''s findings, but examination of his model reveals an error which makes it inapplicable to this situation: he confounded gametic and genotypic viabilities, a course which invalidates some of his findings. This paper describes a more appropriate model, which has been used to study the polymorphism. It is shown that Wallace''s viabilities fit neither the natural nor his experimental populations, and new viabilities are suggested for each case.