用“alternation of generations”造句大全，alternation of generations造句
antithetic alternation of generations
the spore-producing individual or phase in the life cycle of a plant having alternation of generations.
The concept of an alternation of generations can be extended to the flowering plants in which the embryo sac and pollen represent the much reduced famale and male gametophyte generations respectively.
The gamete-producing phase in a plant characterized by alternation of generations.
Like thallose liverworts, the hornworts have an alternation of generations in which the gametophyte is a dorsiventral flattened green phallus and the saprophyte is an upright structure that has a foot embedded in the gametophytes, from which it draws nutrition.
Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes.
homologous alternation of generations
Hofmeister, Wilhelm friedrich benedict(1824-77) German botanist who first demonstrated the alternation of generations in lower plants.
