BIOL 1106 Lecture Notes - Lecture 6: Endosperm, Flowering Plant, Outcrossing

• School: Virginia Tech
• Department: Biological Sciences
• Course: BIOL 1106
• Professor: J. Evans

Document Summary

Lesson 6 unique features of reproduction in angiosperms. Structure and evolution of flowers: flowers evolved in angiosperms, morphology, complete flower, all four whorls. Trends in floral specialization/symmetry: fusion, reduction, radial symmetry, bilateral symmetry, more advanced. Gamete production: alternation of generations, diploid and haploid generations, pollen grains, microgametophytes, embryo, megagametophytes. Gametophytes: embryo sac, 8 nuclei, 7 cells, pollen grain. Pollination: self-pollination, ecologically advantageous, outcrossing, separation of male and female structures, monoecious, dioecious, dichogamous, self-incompatibility. Insects other than bees: birds, small mammals, wind. Angiosperms and double fertilization: fertilization of eff, formation of endosperm (3n) Embryo development: endosperm and embryo, 3d body plan, suspensor. Food reserves and embryogenesis: development of, food supply, seed coat, fruit surrounding seed. Fruits are adapted for dispersal: fleshy, dry, aggregate, multiple. Dispersal strategies: ripening of fruits, spines of fruits attach to animals, wind travel of seeds, water dispersal. Asexual reproduction: apomixis and diploid embryos, vegetative reproduction, runners/stolons, rhizomes, suckers, adventitious plantlets.