BIOL 142 Lecture Notes - Lecture 24: Ventral Anterior Nucleus, Cell Potency, Neurulation
Document Summary
Narrowing of potency during development for somatic cells. Cell types are controlled by differential gene expression. Context (intrinsic, extrinsic, environmental) plays an important role in directing cellular processes: describe how cellular potency changes during development and differentiation. Zygote (fertilized egg) undergoes cleavage (cell # increase without increasing size) making a ball of undifferentiated cells. Gastrulation cell motility with communication, forming During neurulation mesodermal notochord cells induce ectodermal cells to form neural tube: de ne what differentiates cell types from each other in a multicellular organism. Stem cells: able to self renew or differentiate. Totipotent (can give rise to any cell type) to unipotent (can give rise to a single cell type) Potency: developmental potential; ability to become other cell types. Zygote totipotent can give rise to all lineages. Embryonic stem cells - pluripotent can give rise to all cell types of the body. Cord blood stem cells multipotent can develop into more than one cell type.
