Temporal variation and gametic disequilibrium in Drosophila nasuta
نویسندگان
چکیده
منابع مشابه
On measures of gametic disequilibrium.
Various measures have been proposed for characterizing the statistical association that arises between alleles at different loci. Hedrick has compared these measures with the standardized measure D' proposed by Lewontin on the grounds that this latter measure is independent of allele frequency. Although D' has the same range for all allelic frequencies, in fact, D' is not "independent" of allel...
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D. n. nasuta and D. n. albomicana constitute a pair of chromosomal races with 2n=8 and 2n=6, respectively. The F(1) of these has 2n=7 and it is fertile. There exists a state of karyotypic mosaicism as evidenced by the presence of 26 types of chromosome combinations in F(2), F(3) and F(10) populations. In the midst of this karyotypic noise, the karyotype similar to that of F(1) reached 51% of th...
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Five different measures of gametic disequilibrium in current use and a new one based on R. C. Lewontin's D', are examined and compared. All of them, except the measure based on Lewontin's D', are highly dependent upon allelic frequencies, including four measures that are normalized in some manner. In addition, the measures suggested by A. H. D. Brown, M. F. Feldman and E. Nevo, and T. Ohta can ...
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متن کاملLikelihood analysis of recombinational disequilibrium in multiple-locus gametic frequencies.
Likelihood methods are developed for the estimation and testing of multiple-locus gametic disequilibria, using log-linear models of parametric effects. The estimates of disquilibrium are related to Kimura's Z-measure, and may be extended to multiple alleles and multiple loci. Likelihood ratio test criteria are constructed, which are asymptotically distributed as chi(2). The analysis is partitio...
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ژورنال
عنوان ژورنال: Hereditas
سال: 2008
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1988.tb00190.x