Although flowers seem to have evolved because they attract pollinators and increase the dispersal of sperm, many species can self$-$pollinate, some species are obligate out$-$crossers, and some species are obligate self$-$pollinators.$$ In this last group of plants, the flowers never fully open and the ovules must be pollinated by pollen of the same flower. These reproductive strategies differ in their implications for evolutionary potential. Describe the circumstances under which each pollination strategy would be beneficial and under which circumstances each would be detrimental. How, for example, might a self$-$incompatible species fare as a small founder population or remnant population in a severe population bottleneck, as compared with a species that can self$-$pollinate?