The failure of gametes from the same plant to form a viable embryo is known as self-incompatibility (SI). The process was initially studied in ornamental tobacco, where it was noticed that pollen grains that fell on the stigma of the same plant failed...

Self-incompatibility (SI) is a general name for several genetic mechanisms in angiosperms, which prevent self-fertilization and thus encourage outcrossing. In plants with SI, when a pollen grain produced in a plant reaches a stigma of the same plant or...

ABSTRACT We developed a general model of sporophytic self-incompatibility under negative frequency-dependent selection allowing complex patterns of dominance among alleles. We used this model deterministically to investigate the effects on equilibrium allelic frequencies of the number of dominance classes, the number of alleles...

Francois Jacob once facetiously lamented the arrangement in the human body whereby reproduction is the only function for which an individual is equipped with only one-half of the necessary organs, thus entailing the expenditure of a substantial amount of time and energy into finding...