Fig. 6. Dominant enhancement of the fj phenotype. (A) Table showing genetic interactions with fj hypomorphic alleles. N, number of legs analyzed. Abl^-, Df(3L)stj7, a deletion that removes the abl gene. All interactions are statistically significant at P<0.001 by the ² test (Devore and Peck, 1997). (B) Illustration of ‘complete’ joints (black arrows), ‘partial’ joints (white arrowhead), and ‘fusion’ phenotypes.