01:119:116 Lecture Notes - Lecture 8: Mitosis, Stamen, Double Fertilization
4 Mar 2016
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Terrestrial life - lots of challenges vs. marine/aquatic. Naked seeds (because not in container: one clade of seed plants, seeds exposed on modiied leaves, cones (strobili, most are conifers, pine life cycle (fig. 30. 4 - color of arrow signiies ploidy: mature sporophyte = pine tree (2n, sporangia - scale-like in cones, ovulate cone, pollen cone - makes the microgametophytes/male gametophytes that are found on microsporangium, ovule, pollination (fig. Welwitschia mirabilis (a)lifespan - thousands of years (b)only found in southwestern. 30. 8) (1) usually arranged in concentric layers (the following will order the layers from outside to inside:) (a) sepals (i) (ii) (iii) Sterile - do not produce gametes (b)petals (i) Usually brightly colored (ii) often attract pollinators (a) (if they are wind-pollinated, usually not brightly colored) (iii) 2 parts (a) filament: stalk (b)anther: terminal sac, site of (d)carpels (female part of lower) pollen production (i) (ii) (iii) (iv) Key structure that distinguishes angiosperms from gymnosperm (derived trait)
