BIOL 11100 Lecture Notes - Lecture 14: Somatic Cell, Cloning, Cephalization
14 Apr 2016
School
Department
Course
Professor
Document Summary
Developmental stages: morula: solid ball of cells, blastula: hollow sphere of cells, gastrula: hollow sphere of cells w/ tube through center that forms alimentary canal. Gastrulaion: indentaion forms in blastula (invaginaion), forms blastopore. Germ layers- layers of issue in developing organism: endoderm: inside; in triploblasts, only forms alimentary canal, ectoderm: outside; in triploblasts forms skin, nervous system, mesoderm: in middle; only in triploblasts, forms muscles, circulatory system, bones and reproducive system. Earnst haekel"s (disproven) theory that embryos go through stages represening all evoluionary history (arist) Maternal substances in egg that inluence course of early development o o o o o o. Nuclei of zygote cells exposed to dif cytoplasmic determinants. Guide developmental fate of cell by regulaing gene expression. Inducion: environment around cells also afects development as # cells in embryo increases. Signals b/w embryonic cells cause changes o o. Binding of growth factors releases by neighboring cells. Signaling molecs send cells down paricular path, resuling in observable changes.
