The dependent generation in the alternation of generations in moss is the gametophyte generation. This is because the gametophyte generation is the dominant and independent generation in moss life cycle. The sporophyte generation, on the other hand, is dependent on the gametophyte generation for nutrients and support. The gametophyte generation produces gametes, which then fuse to form a sporophyte, which remains attached to and dependent on the gametophyte for its nutrition and growth.
