BIOL321 Lecture Notes - Biopolymer, Primordium, Hydrogen Bond

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Alternation of generations: refers to the alternation of sporophyte and gametophyte life forms during sexual reproduction in all plants. Seedless vascular plants: fern life cycle: sporophyte is dominant, gametophyte is significantly reduced in physical size, sporophyte and gametophyte are independent at maturity (unlike bryophytes and seed plants, alternation of generations: Most svps are homosporous (1 type of spore) Gametophytes can be female, male, or bisexual: gametophytes are short lived and small, have archegonia (egg) and antheridia (sperm) Heterosporous svps produce two types of spores: megaspores (large), microspores (small) Svps re ly on water for fertilizations. Seed plants: life cycle of gymnosperms and angiosperms: sporophyte is dominant. Produces spores by meiosis is hetersporous; female gametophyte develops from megaspore, male gametophyte develops from a microspore: gametophyte is significantly reduced in physical size. Pollen is male gametophyte, ovule contains female gametophyte. Produces gametes by mitosis: sporophyte is independent at maturity, while gametophyte is dependant.

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