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A Model for Evaluating Progress from Recurrent Selection¹

A model was developed to study the relationship between the change in the mean and changes of allelic frequencies in improved populations arising from recurrent selection. The change in the mean in the improved populations is a function of p, the weighted average change in allelic frequency, , the average effect of a gene substitution in the base population, and R, the change in inbreeding depression in the improved populatious.

The model is illustrated by use of data from two studies designed to evaluate recurrent selection methods in corn (Zea mays L.). The analysis indicated significant changes in the weighted average change in allelic frequency and in the amount of inbreeding depression in these populations. Direct and indirect effects of selection were not significantly different in most of the populations studied.

Key Words: Corn • Zea mays L. • Direct response • Indirect response

² Research geneticist, USDA.

Received for publication August 17, 1978.

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