Epistasis and the genetic divergence of photoperiodism between populations of the pitcher-plant mosquito, Wyeomyia smithii

Article Abstract:

The components of genetic variation in crosses between southern and northern populations of the pitcher-plant mosquito, Wyeomyia smithii were determined. The trait assessed was critical photoperiod in first and second generation hybrids. Genetic analysis to determine nonadditive effects showed that digenic epistatic effects were highly significant, indicating that divergence is a result of both additive and nonadditive, especially epistatic effects. Therefore, models which assume strictly additive genetic effects may not be sufficient to describe actual genetic divergence of populations.

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Analysis of Assamese, Australian, Cambodian, Caucasian, Chinese and Melanesian populations, part 1

Article Abstract:

Several highly polymorphic DNA loci in Assamese, Australian aborigines, Cambodian, Caucasian, Chinese and Melanese populations were analyzed to determine major differences between these populations. The results showed that Caucasian populations were the most heterozygous, followed by Chinese and Cambodian. However, the variations observed in heterozygosity were not very large, and further analysis showed that only Caucasians show significant differences at one to three loci. The results also showed that specific groups of alleles could be used to differentiate each of the populations.

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Independence of VNTR alleles defined as fixed bins

Article Abstract:

Data at six unlinked variable number of tandem repeats (VNTR) loci for Caucasians, Blacks and Hispanics was analyzed. No correlations between lengths for pairs of VNTR fragments, within or between loci, were found. When the fragments were grouped into discrete 'bins' to facilitate comparisons between genotypes, no disequilibrium was found within the Caucasian data set within and between loci. However, disequilibrium was found for the Black and Hispanic data bases. In the presence of global disequilibrium for a genotype, testing specific for that data base can be substituted.

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