To fill out this diagram with the mitosis, meiosis, and ploidy , we start with the definition that spores are haploid (N).
Based on knowing that as the sperm and eggs are N, the gametophyte is also N (as only fusion can make something go from N to 2N).
Then I know that the link between spores and gametophytes is mitosis, as we go from N to N.
Similiarly, as zygotes are 2N, and spores are N, either the link between zygote to sporophytes OR the link between sporophytes to spores must be meiosis.
Can I figure out at which stage meiosis occurs with this information, or do I need to know more about the definitions of the different parts of the life cycle? How do I know that sporophyte to spores, and not zygote to sporophyte, is Meiosis?