BIOL 1105 Lecture Notes - Lecture 20: Pattern Formation, Morphogenesis, G2 Phase
27 Nov 2017
School
Department
Course
Professor
Document Summary
Development- the process by which a single cell of a fertilized egg becomes a fully-formed adult. Four processes: cell division, cell differentiation, pattern formation, morphogenesis. 1: basic mechanisms of development are conserved. C elegans- the only model organism which a complete cell lineage has been mapped. African claude frogs- large eggs that allow for studying the early embryo: also go through morphogenesis. Cell division is a developmental process: cell division is required to transform the single-celled zygote into a multicellular organism. In early embryos, the first cell division are called cleavages. Cell cleavage has the following characteristics: cleavages occur rapidly, no g1 or g2 phase, no cell growth. Stem cells are the key component of development: Stem cells are not fully-specified, meaning they can give rise to multiple cell types. Characteristics: the ability to divide and produce more stem cells, the ability to divide and produce daughter cells of a specific type or types.
