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Inheritance of an Exposed Stigma Mutant in Alfalfa, Medicago Sativa L.¹

Synopsis: Tetrasomic inheritance of a single factor difference was postulated to explain F₂ and backcross ratios from a cross involving normal x exposed stigma. Forty eight F_i plants were normal. Of 17 F₂ progenies, 9 segregated approximately 35:1 and 8, approximately 3:1. Respective backcross; ratios were 5:1 and 1:1. Deviations from expected ratios indicated a deficiency of recessive genotypes, due possibly to partial selection against recessive gametes.

² Formerly graduate student, now on the faculty of the Escola de Agronomia e Veterinaria, Universidade do Rio Grande do Sul, Porto Alegre, RGS, Brazil, and Professor of Agronomy (Farm Crops), Iowa State College, respectively.