BIO207H5 Study Guide - Blastoderm, Syncytium, Morphogen
Document Summary
Development commences with a single fertilized egg, giving rise to cells that have different developmental fates. Development of body structures relies upon three processes: (i)establishment of egg polarity by molecular gradients (prefertilization) (ii)compartmentalization of the embryo into distinct regions or segments. www. notesolution. com (iii)establishment of segment identity (head vs. thorax vs. abdomen) Development of body structures relies upon three processes: (i) polarity, (ii) compartmentalization, (iii) identity. Sequential process occur in a highly structured waystepwise progression. Genetic programs each process dependent upon the expression of particular sets of genes. Gene regulatory hierarchy those genes that are expressed early regulate the expression of genes that follow. Encodes a transcription factor a protein that interacts with rna polymerase to either activate or repress transcription. (ii) nanos (nos) is responsible for patterning the posterior of the embryo. Encodes a protein that acts as a translational repressor prevents mrna from being translated into protein.
