BIO207H5 Chapter Notes -Gonad, Body Plan, Oogenesis
Document Summary
Development: process of regulated growth that results from the interaction of the genome with the cytoplasm and the extracellular external environment and that involves a programmed sequence of cellular level phenotypic events that are typically irreversible. For a multicellular organism, development starts when a zygote is formed by fusion of sperm and egg. The zygote is totipotent (meaning that the cell has the potential to develop into any cell type of the complete organism. Cells later in development may also be totipotent; this is common in plants, but uncommon in. As development progresses, the developmental potential of most cells decrease. In most cases cell determination occurs by induction; that is, an inductive signal by one cell or. This is still a relatively early stage of development, so although a determined cell is molecularly animals past the four cell embryo stage. The ability of a cell to become different cell types during development is called developmental potential.
