Tobacco plants are known to maintain as many as 12 alleles at a single self-incompatibil

Tobacco plants are known to maintain as many as 12 alleles at a single self-incompatibility locus within a population in order to prevent mating between close relatives. Which of the following processes is this most likely to be the result of?
a.

Genetic drift

b.

Directional selection

c.

Frequency dependent selection

d.

Co-dominance

e.

Beneficial mutations

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