BISC 337 Lecture Notes - Lecture 17: Meristem, Cellular Differentiation, Gametophyte

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Plants grow from single cells and retain groups of undifferentiated and dividing cells throughout their lives. Primary growth and formation of the plant body. Irreversible increase in size: cell division, expansion (enlargement) What is morphogenesis: acquisition of a particular shape or form. What is cellular differentiation: process by which cells with identical genetic information become different from one another: fate of a plant cell is determined by its position, not the lineage. Meristems contain meristematic cells capable of dividing repeatedly to produce: One daughter that remains in the meristem = initial. One daughter that becomes a new body cell = derivative. These primary meristems are also produced during embryogenesis. Cells in these primary meristems remain meristematic prior to differentiating. Establish the basic tissue patterns of the plant: sam = shoot apical meristem, ram = root apical meristem. Give rise to: 1) tissues of stem and root, 2) leaves, lateral buds, flowers.

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