amorphic allele - molecular evidence
12 base deletion and one base insertion (T) in the coding sequence of TpnC4 leads to a frameshift and early translation termination.
12bp deletion plus a 1bp insertion near the 5' end of the TpnC4 coding region. This is predicted to produce a polypeptide consisting of the first 6 amino acids of TpnC4 followed by 5 amino acids and a stop codon.
abnormal jump response
flightless (with Df(2R)BSC696)
TpnC4F2-3 homozygous adults display significant decrease in their jumping ability (reduced jump distance) and are completely flightless.