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Comparisons of the genetic and cytogenetic maps of three sibling species of Drosophila reveal marked differences in the frequency and cumulative distribution of crossovers during meiosis. The maps for two of these species, Drosophila melanogaster and D. simulans, have previously been described, while this report presents new map data for D. mauritiana,(More)
Two closely related species of Drosophila, D. simulans and D. mauritiana, differ markedly in morphology of the posterior lobe of the male genital arch. Both size and shape aspects of lobe variation can be quantified by a morphometric descriptor based on elliptical Fourier and principal components analyses. The genetic architecture of this quantitative trait(More)
The size and shape of the posterior lobe of the male genital arch differs dramatically between Drosophila simulans and D. mauritiana. This difference can be quantified with a morphometric descriptor (PC1) based on elliptical Fourier and principal components analyses. The genetic basis of the interspecific difference in PC1 was investigated by the(More)
Drosophila simulans and D. mauritiana differ markedly in morphology of the posterior lobe, a male-specific genitalic structure. Both size and shape of the lobe can be quantified by a morphometric variable, PCl, derived from principal components and Fourier analyses. The genetic architecture of the species difference in PCl was investigated previously by(More)
By investigating the extent to which target directors bargain in their own interests during negotiations between merging banks, we document a strong inverse relation between merger premium and target director retention. This relation holds for both executive (inside) directors and independent outside directors, and other governance mechanisms of targets and(More)
Using 38 years of data, we show that U.S. monetary policy has had, and continues to have, a strong relationship with security returns. Specifically, we find that U.S. stock returns are consistently higher and less volatile during periods when the Federal Reserve is following an expansive monetary policy. Further, firms considered to be more sensitive to(More)
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