Article Abstract:
Evidence that female preferences for exaggerated secondary sexual traits can influence trait expression in offspring has come from a sib analysis of the length of the sexually selected forceps of male European earwigs, Forficula auricularia. Significant levels of additive genetic variance were found. Using both sib analysis and an estimate from the phenotypic and genotypic correlations of both sides, no evidence for additive genetic variance in forceps fluctuating asymmetry (FA) was found. There is some reason to believe that females searching for 'good genes' should be impressed by ornament symmetry.
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Article Abstract:
Methods have been developed for calculating the variance and mean of the number of animals with a desired genotype in every backcross generation for marker-assisted introgression experimentation. The goal is having animals homozygous for desired loci. The methods were developed for experiments with inbred lines and the model assumes Poisson litter size distribution. It is like that used in stochastic versions of population dynamics models. .
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Article Abstract:
The strong genetic structuring that has been found using allozyme and mtDNA control region variation in a habitat specialist, the freshwater Oxleyan pygmy perch, Nannoperca oxyleyana, which is to be found in only a restricted area in Australia, is discussed. Four streams may have had a confluence relatively recently, perhaps when sea level was lower, because four sites along 200 km of coast were surprisingly similar.
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