Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)


Since the acceptance of Mendelism there has been an ever increasing and universal interest in quantitatively inherited characters in organisms. Environmental influences together with polygenic complexes have challenged research into an attempt to separate environmental and genetic variances. With this information, the plant breeder may make more rapid advances toward .desired goals.

Genetic investigations relative to breeding behavior of quantitatively inherited characters in soybeans are limited. This study is an attempt to add new information relative to the segregation, mode of inheritance, manner of gene action and the interrelations among five commercially important characters: seed size, maturity date, protein percentage, oil percentage and iodine number of the oil.



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