6 Unique Features of Reproduction in Angiosperms - Unique Features of Reproduction in Angiosperms Structure and Evolution of Flowers o Flowers evolved

6 Unique Features of Reproduction in Angiosperms - Unique...

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Unique Features of Reproduction in Angiosperms Structure and Evolution of Flowers o Flowers evolved in Angiosperms o Morphology Complete flowers Incomplete flower o Caylx-outermost, protects flower bud o Corolla- attract pollinators o Gynoecium- female parts, consist of one or more carpels with Ovules o Androecium- stamen male structures, most have a filament and an anther Trends in Floral specialization/symmetry o Fusion o Reduction o Redial symmetry o Bilateral symmetry Gamete Production o Alternation of generations Diploids & haploid generations Pollen grains Microgametophytes- male or pollen grains Embryo Sac Megagametophytes-female gramediphyte Gametophytes o Embryo sac 8 nuclei 7 cells o Pollen Grain-weather resistant walls for surface species for the species-tube cell and generative cell to produce two sperm Pollination o Self-pollination Ecologically advantageous in an environment without pollinators. More genetically similar. Not clones because meiosis is involved
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