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Stepwise mutation model for hybrid sterility (or inviability) genes. (A) In the stepwise mutation model, the forward and backward mutation may occur. (B) The fertilities for various haplotypes for loci A and B (two-locus model) and genotypes for locus A (one-locus model) are given by 0 (infertile) or 1 (fertile). Distantly related haplotypes or genotypes are infertile.
