Abstract
Starch gel electrophoretic analysis of crude seed (cotyledonary) extracts of Phaseolus vulgaris, P. coccineus,F1,F2,F3,and reciprocal F1backcrosses reveals monomorphic and polymorphic forms of leucine aminopeptidase (LAP) in the genus. The polymorphic forms (LAP-II) are controlled by the codominant alleles, Lap-IIa and Lap-IIb.Reciprocal backcrosses to both species show a highly significant deviation from the expected 1:1 ratio when the donor parent allele is transmitted through male gametes. There is not a significant deviation from the expected ratio when transmission is through female gametes. Differential gametic selection, in conjunction with differential sterility, suggests that structural differences exist between the genomes of these species.
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