TAILIEUCHUNG - Báo cáo sinh học: "Approximating selection differentials and variances for correlated selection indices"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Approximating selection differentials and variances for correlated selection indices | Genet Sei Evol 1995 27 551-565 Elsevier INRA 551 Original article Approximating selection differentials and variances for correlated selection indices F Phocas J J Colleau Institut national de la recherche agronomique station de génétique quantitative et appliquée 78352 Jouy-en-Josas cedex France Received 1st June 1994 accepted 1st August 1995 Summary Empirical formulae were derived to approximate selection differentials and variances of the selected estimated breeding values when the estimated breeding values of the candidates for directional selection are multinormally distributed and correlated in any manner. These formulae extended the well-known exact basic form for the equicorrelated case taking into account selection pressure average pairwise correlation coefficient and average standard deviation of pairwise correlation per observation through polynomials fitted to simulated data. Simulations were carried out for different correlation structures 1 2 or 3 different intra-class correlations per family ranging from to for different numbers of independent families 1 2 5 or 10 for constant or variable family size and for selection pressures ranging from to 50 . On average 90 of the bias occurring when ignoring correlations between observations was removed by our prediction formula of selection differential or variance of selected observations. Comparisons with other correction methods which assume special correlation structures were also carried out. selection differential correlated indices finite population Résumé Approximations empiriques des differentielles de selection et des variances pour des indices de selection corrélés. On propose des formules de calcul approché des differentielles de selection et des variances d index de selection après selection direction-nelle quand les candidate à la selection ont des index distribués normalement et corrélés de manière quelconque. Ces formulas ont pour base celles établies en cas d equicorrelation .

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