In bryophytes, the dominant phase is represented by  gametophytic plant. The gametophyte is independent, photosynthetic, thalloid phase. Antheridia and archegonia are formed on the gametophye. These organs are multicellular. These organs bear the respective gametes, viz. male and female. The antheridium produces biflagellate antherozoids. The archegonium is flask-shaped. It produces a single egg.

Transfer of antherozoids to the archegonium take place through water. Flagella in the a ntherozoids facilitate motility. Zygote is formed after fertilization. But the zygote does not undergo meiosis immediately after fertilization. It develops into a multicellular body called sporophyte.
The sporophyte in bryophytes is much smaller and is not independent but attached to the gametophyte. It gets nutrition from the gametophyte. It is clear that the gametophyte is dominant phase in the life cycle of  a bryophyte in every aspect. Gametophyte is  independent and photosynthetic. It is much larger in size compared to the sporophyte.  
On the other hand, the sporophyte is not free-living but remains attached to the gametophyte so that it can get nutrition.