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ALLOZYME FREQUENCY CHANGES ASSOCIATED WITH SELECTION FOR INCREASED GRAIN YIELD IN MAIZE (ZEA MAYS L.)
C. W. Stuber 1, R. H. Moll 2, M. M. Goodman 3, H. E. Schaffer 2, and B. S. Weir 4
1 Agricultural Research, Science and Education Administration, U.S.D.A. and Department of Genetics, North Carolina State University, Raleigh, North Carolina 27650
2 Department of Genetics, North Carolina State University, Raleigh, North Carolina 27650
3 Departments of Statistics, Genetics, and Botany, North Carolina State University, Raleigh, North Carolina 27650
4 Department of Statistics, North Carolina State University, Raleigh, North Carolina 27650
Frequency changes of alleles at eight enzyme loci were monitored in four long-term maize selection experiments. The results indicate that changes in frequencies of the alleles at these loci are associated with changes due to selection for improved grain yield. The frequencies changed more than is consistent with the hypothesis of selective neutrality. In addition, significant deviations from a random-drift model were nearly always accompanied by significant linear trends as would result if allozyme frequencies respond to directional selection. Evaluations of linkages and linkage disequilibria in the selected populations indicate that the eight enzyme loci responded independently as selection progressed.
Submitted on August 27, 1979Revised on January 7, 1980
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