Received April 8, 1970 A large number of enzyme polymorphisms have been reported in both plant and animal species in the past few years. SHAW(1965),in his comprehensive review of electrophoretic variation i enzymes in diploid organisms, concluded n that â. . . it would seem thiat enzymes which vary are the rule rather than the exception.â A recent survey of enzyme polymorphisms in natural populations of Avena fatua (L.) and A . barbata (Brot.) in central California provides additional support for this contention and indicates that populations of these heavily inbreeding species often contain substantial stores of isoenzymatic variability (MARSHALL and ALLARD 1970). These findings raise the question of the nature and magnitude of the forces responsible for maintaining the observed variation. In the present report, evidence is presented which indicates that heterozygote advantage of isozyme loci and/or their associated linkage blocks is a major factor in the maintenance of polymorphisms in A . bmhnta. MATERIALS A N D METHODS Two natural populations of A . barbata occurring in the San Francisco Bay region of central California were chosen for study. One of these populations, designated SRB, occupies a moist site near U.S. Highway 101 in Marin County
Genetics – Genetics Society of America
Published: Oct 1, 1970
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