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Early Developmental Steps definitions

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Termini in questo insieme (15)

  • Fertilization
    Union of egg and sperm initiating development, leading to a single cell with combined genetic material.
  • Nuclear Division
    Process where nuclei multiply within a single cell membrane, increasing genetic content without cell division.
  • Primordial Germ Cells
    Early cells set aside during development that will eventually give rise to gametes in the adult organism.
  • Blastoderm
    Single-cell-thick layer formed when nuclei are enclosed by membranes, surrounding the embryo about 3 hours post-fertilization.
  • Gastrulation
    Developmental phase where three primary germ layers form, setting the stage for tissue and organ differentiation.
  • Endoderm
    Innermost germ layer that will become internal linings such as the gut and associated organs.
  • Mesoderm
    Middle germ layer giving rise to tissues like muscle, bone, and blood within the developing embryo.
  • Ectoderm
    Outermost germ layer forming structures such as skin and the nervous system.
  • Segmentation
    Process following gastrulation where the embryo divides into distinct body regions like thorax and abdomen.
  • Hox Genes
    Genetic elements activated during segmentation that direct the formation of specific body parts along the embryo.
  • Cell-to-Cell Interaction
    Communication between neighboring cells or with their environment, crucial for proper differentiation and development.
  • Egg Asymmetry
    Uneven distribution of molecules within the egg, influencing developmental fate and body axis formation.
  • Nurse Cells
    Supportive cells surrounding the egg in fruit flies, responsible for producing and localizing developmental proteins.
  • Bicoid Protein
    Molecule concentrated at one end of the fruit fly egg, directing anterior development and establishing polarity.
  • Symmetric Egg
    Egg with evenly distributed molecules, where developmental axes are determined by the site of sperm entry.