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🧭 Axis Determination

Embryonic axes (anterior-posterior, dorsal-ventral) arise from maternal gradients and symmetry-breaking events. In Drosophila, bicoid mRNA localizes anteriorly; nanos posteriorly.

Anterior determinant
Posterior determinant
Generation: 0
AP Polarity: Symmetric
Head Region: 0%
Trunk Region: 0%
Tail Region: 0%
Drosophila AP Axis:
Bicoid: Anterior morphogen → head structures
Nanos: Posterior, represses hunchback → abdomen
Gap genes: Hunchback, Krüppel, Giant, Knirps
Maternal-effect genes establish initial polarity