The evolution of the G matrix: selection or drift?

Article Abstract:

The evolution of the G matrix is discussed in this review article with focus on whether selection or drift is the issue. Natural selection does not usually have an effect on single traits or paris of traits, acting rather on the entire organism. It is more appropriate to consider a multivariate extension of the central quantitative genetics equations for which G is the matrix of genetic variances and covariances. The action of drift can be separated from that of selection because it produces a proportional change in G while selection does not in general. More research is needed on predicted statistical distribution of G from selection and/or drift. More statistical tests to tell them apart should be developed.

Canada, Research, Models, Usage, Multivariate analysis, Natural selection, Variation (Biology), Heredity, Quantitative genetics

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Polygenic and single gene responses to selection for resistance to diazinon in Lucilia cuprina

Article Abstract:

The genetic responses observed during selection within compared with selection outside the phenotypic distribution of susceptibles of Lucilia cuprina treated with lethal doses of diazinon were determined. Selection outside the distribution induced strains that were equivalent to a resistant variant that evolved in natural populations. These variants contain a mutant esterase, E3, encoded by Rop-1, which hydrolyzes diazonin more effectively. In contrast, selection within the phenotypic distribution of susceptibles produced a response of less magnitude and was independent of E3. In this case, the selection involved a polygenic response.

Genetic aspects, Diazinon, Pesticide resistance

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