BackEarly Developmental Steps definitions
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1/15BackSkip to main contentBackFertilization
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.
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