Mutation is located within the 1.7kb initiator fragment in the first intron of abd-A, within the Kr binding site. This is the same substitution as in abd-AHab-2 though additional polymorphisms establish that the mutations were independent events.
Nucleotide substitution: G251A.
Transformation of portions of T3 towards A2, haltere and/or third leg become wing material. More individuals display the transformation at higher temperatures.
Duncan.