COMPARISON OF PREDICTED AND SIMULATED RESPONSES TO S1 SELECTION IN A DIPLOID, CROSS-FERTILIZED SPECIES

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Abstract
Computer simulation was used to test the accuracy of mathematical formulae for predicting mean response and variance of response to S1 per se recurrent selection under both additive and complete dominance genetic models. S1 selection was simulated at two levels of selection intensity (5 and 25%) and two levels of narrow sense heritability (0.2 and 0.6) for 15 cycles. In each cycle, 400 S1 families were evaluated in simulated trials consisting of one replication of 10-plant plots at each of four locations. The character under selection was controlled by 40 independently assorted loci. For both genetic models, variance component analysis provided good estimates of genetic variance and the predicted gains were in good agreement with the simulated gains. The simulated coefficient of variation of response was small and was very close to the predicted coefficient of variation in each of the four selection regimes under both models.

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