In the alternation of generations life cycle, adults are:

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In the alternation of generations life cycle, there are two distinct multicellular forms, the haploid gametophyte and the diploid sporophyte. The sporophyte is derived from the zygote (fusion of gametes) and it goes through meiosis to produce haploid spores. These spores grow into multicellular gametophytes that produce haploid gametes. The gametes fuse during fertilization to form a diploid zygote, which develops into a new sporophyte. Therefore, adults in the alternation of generations life cycle can be either haploid gametophytes or diploid sporophytes.

In the Alternation of Generations Life Cycle, Adults Are