Wrong forum. Try the botany forum. But this is how it generally works. In the Bryophtyes (Mosses) the gametophyte generation is dominant and the sporophyte generation grows out of the top. In the rest the Pterophytes (ferns), gynmosperms (conifers), and angioperms (flowering plants) the sporophyte is dominant and then the gametophyte stage. Thats for plants.