Life cycle of a moss

production of gametes and Fertilization
Archegonia produce eggs
1. 1 egg retained at the base of each archegonium
2. egg and sperm produced by mitosis
on same plant identical - on different plants cross fertilitation
Antherida produce sperm
1. flagellated and released to exterior
  1. fertilation dependent on wter droplets to splash the sperm from the antheridal cups to the archgonial cups
    1. the sperm swim in the layer of water down the venter (neck)
      1. toward the egg at the base of the archegonium
        fusion of an egg and sperm produce a diploid zygote
Meiosis and production of spores
zygote at base of the archegonium
1. develops into seta
  1. topped by a capsule containing a sporangium
    1. haploid cells in the sporangium
      1. spores produced by meiosis
        genetically variable
      2. when the spores are ripe the capsule splits allowing the spores to be shaken out by the wind
        Germinating spore produce protonema
        turns into gametophyte

Zusammenfassung der Ressource

	Erstellt von ZC_ vor etwa 11 Jahre