No lesion detected in exon I/IIb.
General characteristics of mutant phenotype (heterozygous with a viable allele): Song pulse - mutant; Optomotor test - wild-type; CC-phototaxis - wild-type; Y-phototaxis - wild-type; ERG transients - wild-type; ERG LCRP amplitude - wild-type; ERG LCRP kinetics - wild-type; ERG Rebound - wild-type; ERG refractory wandering - wild-type.
Extensive phenogenetic analysis of allelic combinations reveals a phenotypic series for visually mediated behaviors and genetically separable ERG defects and courtship song defects.