Week 4 Notes

35 12714 angiosperm diversity the role of genome

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Unformatted text preview: s of mosses, and 25 species of liverworts 1 Sporangium releases spores formed by meiosis. 2 Each germina:ng spore forms a protonema that grows into a budlike mass. Protonema Bud Rhizoid MEIOSIS Mature sporophyte topped by sporangia Male gametophyte Female gametophyte 3 Each bud develops into a male gametophyte with antheridium or a female gametophyte with archegonium. HAPLOID (n) Sexual Reproduc:on DIPLOID (2n) Antheridium Archegonium on female on male gametophyte gametophyte Asexual reproduc:on (gemmae) 6 Zygote remains in archegonium and develops into small, mature sporophyte. FERTILIZATION Zygote 4 Flagellated sperm develop in antheridia. Eggs develop in archegonia. 5 Antheridia release sperm that swim in film of water to egg in the neck of the archegonium. 30 1/27/14 Seedless Vascular Plants •  Flourished in moist environments during Paleozoic •  Have spores and mo;le sperm •  First seedless plants lacked woody ;ssue •  Woody plants developed in Carboniferous Seedless Vascular Plants - Lycophyta •  Lycophytes –  Vascular seedless plants, club mosses –  Dominated carboniferous forests as trees, modern small...
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