Avuncular relationship The genetic relationship between nieces and nephews and their aunts and uncles.
Axenic culture Pure culture or the growth of a single organism.
Axis of symmetry A structure possessing this axis, when rotated by an angle of 2π/n gives rise to another identical structure.
Axis polarity The orientation of the body in space. This depends on the three axes anterior/posterior, dorsa/ventral, and medial/ lateral. During embryonic development, the axis formation genes establish embryonic body axis and the axis polarity genes control anterior/posterior and dorsal/ventral body orientation.
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