control of development

control of development - B control of development What...

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B) control of development What controls gene expression? ( what controls determination and differentiation?) o [recall table 13-2 p.264) Nuclear Envelope Equivalence – all cells initially have the “same” nucleus, but they eventually specialize to produce specific organs/tissue; all cells have same genetic info/material, but the material is used in different ways o Cytoplasmic substances (prominent in protostomes molecules is cytoplasm which dictate which cells are turned on/off) Examples of these molecules: (may modify/dictate expression of genes in the cells) Proteins mRNA protosome (mosaic) – “mosaic” because need many pieces of the embryo to form a complete organisms; the loss of the parity cells of the embryo is bad o determinant cleavage – cells after cleavage have a predetermined fate; i.e. in mollusks if one cell in the morula is lost, the developments which were fated by that cell would be lost o Induction: Cell-cell or tissue tissue interactions Deuterostomes (regulative) Indeterminate cleavage – cells after cleavage can give rise to
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