BLG 230 Lecture Notes - Lecture 4: Plasmodesma, Antheridium, Seta
25 Oct 2015
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Liverworts (phylum marchantiophyta: mosses (phylum bryophyta, hornworts (phylum anthocerotophyta) From algae to plantae: plantae : bryophytes and vascular plants, equipped to live on land, bryophytes: transition from charophycean green algae to plants. All these traits = adaptations for living on land. Liverworts, hornworts, and mosses: small, leafy , first plant was likely similar to modern bryophytes, wide range of habitats (often moist , often dominant in adverse environments, good and common colonizers. The gametophyte and sporophyte are notably different from one another: review what gametophytes and sporophytes are: Gametophytes produces sexually by producing gametes, eggs, and sperm that are haploid cells that only carry one set of chromosomes. When the sperm and egg fuse, they give rise to the second generation called the sporophyte generation, which is asexual. The sporophyte itself is diploid , so it already has two sets of chromosomes in each cell. It has a little capsule called a sporangium.
