Please enable JavaScript.

Coggle requires JavaScript to display documents.

Animal Development - Coggle Diagram

- - - - actin polymerizes so sperm makes its way through the issue (punches the jelly coat)
        
        fuses with egg membrane, allowing sperm nucleus to enter the egg and accomplish fertilization
        
        vesicles of egg cortex release their content into the extracellular place (prevents additional sperm from fusing with membrane)
    - - Ex. in chickens: egg cell (yolk) is released from ovary down oviduct --> albumen is deposited --> shell --> egg is laid
        
        In humans: oocytes are released into oviduct where it's fertilized --> implants into uterine wall
        
        Humans don't have much yolk so mom has to give nutrients to baby
  - - - during cleavage, body axes are specified: anterior (head), posterior (tail), dorsal (back), ventral (belly)
        
        specification of different domains of the embryo depends on combo of intrinsic and extrinsic factors
        
        intrinsic (in the egg): molecules in the egg are not uniformally distributed, daughter cells get different determinants
        
        in Drosophila: cell division without membranes forming --> nuclei migrate to cell periphery (now membranes form)
        
        the nuclei are exposed to the factors in a common cytoplasm
        
        inherant symmetry: bicoid protein in anterior axis, nano protein in posterior axes
        
        extrinsic (where sperm enters the egg, what cells surrounding the egg are doing, extracellular ligands present in different concentrations in embryo, light)
  - - - changing environments/contacts --> different developmental fates
- - - - if green cell ends up developing like other yellow cells in the region: determination had not occured at this stage