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Meiotic Drive in Natural Populations of Drosophila melanogaster. III. Populational Implications of the Segregation-Distorter Locus

Yuichiro Hiraizumi, L. Sandler and James F. Crow
Evolution
Vol. 14, No. 4 (Dec., 1960), pp. 433-444
DOI: 10.2307/2405993
Stable URL: http://www.jstor.org/stable/2405993
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Meiotic Drive in Natural Populations of Drosophila melanogaster. III. Populational Implications of the Segregation-Distorter Locus
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Abstract

An attempt has been made to demonstrate empirically three points: (1) That meiotic drive can be an operative evolutionary force. The demonstration of this is simply that we find, in natural populations of Drosophila, high frequencies of SD loci which are themselves associated with a reduced fitness. (2) That the quantitative predictions from considerations of what ought to happen when meiotic drive appears in a population are, roughly at least, true. The demonstration here is that the equilibrium frequencies and the rate of change in these frequencies in experimental cages of Drosophila containing SD are in rough agreement with quantitative prediction. And, finally, (3) to show at least one way in which a population, whose fitness is being reduced by the spread of detrimental driven loci may counteract this detrimental effect. In this instance, the result is accomplished by the accumulation of SD+ alleles insensitive to the distorting action of SD. This accumulation is either by selection alone or possibly by selection and induction of insensitive alleles by a process analogous to (or identical with) the previously reported phenomenon of translocal modification. A mathematical analysis of a number of special cases of meiotic drive is included.

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