BIOL 2301 Lecture Notes - Lecture 27: Morphogenesis, Ecdysone, Zygote
23 Mar 2018
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Document Summary
Newly laid egg is a one giant cell with one nucleus in it. These cells migrate to different spaces within the embryo and then cell walla develop around them. Nuclei end up at the edge of the cell. Most of these cells are already predetermined to become a specific larval and adult structure. If patches of cells are removed, the larval and adult structures those cells were supposed to contribute to won"t form. The cells know what to become because of the specific pattern of gene expression in their part of the embryo. We know this bc patches have been removed to see the effect. Patterns of gene expression determine what the cells will become. Series of 3 diff flourescent proteins tagging 3 diff promoters in the embryo. Strong banding patterns and diff indicates the various gene expressions. Patterns of the rna molecules provide polarity cues.
