voc. deff.

voc. deff. - Positional info. molecular cues that control...

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Model organism – when the primary research goal is to understand road biological principles , the organism chosen for study Cell differentiation – process by which cells become specialized in structure and function. Morphogenesis – physical process that gave an organism its shape, meaning creation of form. Apical meristems – structures responsible for a plant’s continual growth and formation of new organs Pluripotent – to give rise to multiple but not all cell types Stem cells – is a relatively unspecialized cell that can both reproduce itself and under appropriate conditions differtiate into specialized cells of one or more types Cytoplasmic determinants – maternal substances in the egg that influence the course of early dev. Induction – the process in which the signal molecules cause changes in nearby target cells Pattern formation – the dev. Of a spatial organization in which the tissues and organs of an organism are all in their characterstic places
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Unformatted text preview: Positional info. molecular cues that control pattern formation collectively Embryonic lethal mutations with phenotype causing death at the embryonic or larva stage Egg polarity genes maternal effect genes Maternal effect gene when a mutant in the mother results in a mutant phenotype in the offspring regardless of their own genotype Morphogens gradient of substances Segmentation genes the genes of the embryo whose products direct formation of segments after the embryos major body axes Homeotic genes the anatomical identity of segments is set by master regulatory genes Cell lineage basically a pedigree Apoptosis programmed cell death Chimera organisms with mix of genetically diff. cells Organ identity gene determines the type of structure that will grow from a meristem Homeo box 180 nucleotide box...
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This note was uploaded on 11/21/2010 for the course OB 12545 taught by Professor Yomany during the Spring '10 term at Mt. Olive.

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voc. deff. - Positional info. molecular cues that control...

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