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Estimates of genetic variance and heritability provide useful guidelines for answering many questions which arise in a plant breeding program. In this paper we have attempted to (a) delineate appropriate questions which can be answered by estimation of genetic variance components and heritabilities (b) examine the assumptions necessary for estimation and (c) clarify the limitations imposed on interpretation of the estimates by the assumptions.
Key Words: Genotype-environment interaction • Variance estimation
2 Associate Professor, Plant Genetics, University of Illinois and Professor of Genetics, North Carolina State University at Raleigh, respectively.
Received for publication July 20, 1968.
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