Alternation of generations is a characteristic life cycle observed in certain organisms, most notably in the groups known as the plant and algal lineages. This biological pattern involves the alternation between two distinct, multicellular phases: the haploid gametophyte phase and the diploid sporophyte phase. In the sporophyte stage, diploid cells undergo meiosis to produce haploid spores, which then develop into the gametophyte. The gametophyte stage is the haploid phase, which subsequently produces the gametes necessary for the continuation of the cycle. This cyclical nature is a fundamental mode of reproduction that ensures genetic diversity and stability across the life span of the organism.