BIOL 3451 Lecture Notes - Lecture 17: Cleidocranial Dysostosis, Chromosome, Chromatin
Document Summary
If eyeless is expressed in other tissues such as legs or wings, then an eye can be formed: eyeless is able to direct the gene expression program for eye formation. Diploid zygote nucleus is produced by fusion of parental gamete nuclei: 2. Nine rounds of nuclear divisions produce multinucleated syncytium: 3. Pole cells form at posterior pole (precursors to germ cells); approximately four further divisions take place at the cell periphery: 4. Nuclei become enclosed in membranes, forming a single layer of cells over embryo surface: 5. Tissue organization occurs very early on in the embryo; segmentation: ~10 hours post-fertilization (hpf), embryo becomes organized into a series of segments (parasegments, segments are defined by their expression pattern of genes, parasegments give rise to adult segments. Imaginal discs: group of undifferentiated cells in insect larvae that develop into a specific adult structure: 6. Invariant lineage from individual to individual: can follow cell states during development in wildtype,
