Biology 1001A Lecture Notes - Lecture 4: Sphagnum, Sporophyte, Cell Nucleus
22 Oct 2016
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It is possible that your kids could need it, your gene could be a selective advantage, maybe over evolutionary time it could evolve into something beneficial. Spores can develop into a new individual without fusing with another cell. They germinate and grow directly by mitotic divisions into a generation of haploid individuals called gametophytes. Some cells in gametophytes develop into egg or sperm nuclei. This is because they are produced by mitosis: all egg or sperm nuclei produced by a particular gametophyte are identical, meiosis does not occur in gametophytes. Fusion of a haploid egg and sperm nucleus produces a diploid zygote nucleus that divides by mitosis to produce the diploid sporophyte generation again. In flowering plants, in the structures of the flower are the reproductive parts. Resulting zygote reproduces by mitosis to form a sporophyte. Peat moss has the gametophyte most visible and familiar stage of the life cycle.
