BSCI 207 Lecture Notes - Lecture 20: Auxin, Meristem, Pattern Formation
15 Oct 2018
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Bsci 207, dr. bretton kent - monday, october 15, 2018. Cell movement (animals) and differential expansion (plants & fungi) Can form any cell in adult body. Activates structural genes (proteins perform metabolic or structural function) Don"t change number of genes, change genes that are expressed. Cells have a fate depending on their location. Cells send chemical signals to each other. Morphogenesis occurs by cascade of induction events (begins at dorsal lip) Range of inducers a cell is responsive to decreases over differentiation. Inducers only produced in certain areas of embryo. Group of cells producing the same inducer molecules. Spatial organization of embryo with respect to body axis. Initial anterior-posterior axis due to cytoplasmic determinants in egg. Subsequent pattern formation based on gradients of specific signal molecules (morphogens) May occur throughout entire embryo (long distance) Produces regional differences in expression of segmental genes determined by concentration. Gap genes- general body regions of embryo. Pair-rule genes- segment pairs within general body regions.
