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Dominance and Genetic Drift

Predicted Effects of Population Subdivision in a Maize Population

^a Dep. of Biostatistics, Univ. of Alabama at Birmingham, RPHB 327, 1530 3rd Ave. South, Birmingham, AL 35294-0022
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (26K): [in a new window]   Fig. 1. Predicted variance among subpopulation means for five two-allele models characterized by degree of dominance (d) and recessive allele frequency (q). For each model, the variance among subpopulations was divided by the variance among completely inbred subpopulations (VB at FST = 1).

View larger version (23K): [in a new window]   Fig. 2. Predicted variance among subpopulation means for grain yield (YLD), grain moisture (MST), and plant height (PHT) in the BS13(S)C0 maize population. For each trait, the variance among subpopulation means was divided by the total variance among completely inbred subpopulations (VB at FST = 1).

View larger version (26K): [in a new window]   Fig. 3. Predicted total genetic variance among noninbred individuals [VW(0)] within subpopulations for five two-allele models characterized by degrees of dominance (d) and recessive allele frequency (q). Predicted genetic variances were divided by the total genetic variance among noninbred genotypic values in the metapopulation [VW(0) at FST = 0].

View larger version (27K): [in a new window]   Fig. 4. Predicted additive genetic variance within subpopulations [VAW(0)] for five two-allele models characterized by degree of dominance (d) and recessive allele frequency (q). Predicted additive genetic variances were divided by the total genetic variance among noninbred genotypic values in the metapopulation [VW(0) at FST = 0].

View larger version (31K): [in a new window]   Fig. 5. Predicted total genetic variance among noninbred individuals within subpopulations [VW(0), labeled VW] and additive genetic variance within subpopulations [VAW(0), labeled VA] for grain yield (YLD), grain moisture (MST), and plant height (PHT) in the BS13(S)C0 maize population. All predicted variances were divided by the total genetic variance among noninbred genotypic values in the metapopulation [VW(0) at FST = 0 and FIS = 0].

View larger version (27K): [in a new window]   Fig. 6. Predicted covariances between inbred genotypic values and inbred breeding values, CGAW(1), (labeled A) and between inbred genotypic values and inbred dominance deviations, CGDW(1), (labeled D) for three two-allele models characterized by degree of dominance (d) and recessive allele frequency (q). Plots are labeled with ordered pairs in parentheses, representing degree of dominance and recessive allele frequency, respectively [e.g., (2, 0.1) represents d = 2 and q = 0.1; allele frequency excluded for d = 0]. All covariances were divided by predicted genetic variance among inbred individuals [VW(1)] at the same value of FST.

View larger version (28K): [in a new window]   Fig. 7. Predicted covariances between inbred genotypic values and inbred breeding values, CGAW(1), (labeled A) and between inbred genotypic values and inbred dominance deviations, CGDW(1), (labeled D) for grain yield (YLD), grain moisture (MST), and plant height (PHT) in the BS13(S)C0 maize population. All covariances were divided by predicted genetic variance among inbred individuals [VW(1)] at the same value of FST.

View larger version (22K): [in a new window]   Fig. 8. Predicted 95% drift intervals for grain yield in the BS13(S)C0 maize population for values of FST ranging from zero to one. The line µ represents the predicted metapopulation mean, lines µ ± 2 are 95% confidence limits for values of individuals, and lines µ ± 2 are 95% confidence limits for values of subpopulation means.

View larger version (22K): [in a new window]   Fig. 9. Predicted 95% drift intervals for grain moisture in the BS13(S)C0 maize population for values of FST ranging from zero to one. The line µ represents the predicted metapopulation mean, lines µ ± 2 are 95% confidence limits for values of individuals, and lines µ ± 2 are 95% confidence limits for values of subpopulation mean.