Heterozygotes have a nick near the anterior midline of the eye and the overall size of the eye is reduced.
Heterozygote has fairly constant reduction in eye size, which is not so great as to exclude its use in combination with most eye colors. Expression more extreme at 25o than at 19oC. Homozygote has smaller eyes but lowered viability.
L4 has visible | dominant | adult stage phenotype, suppressible by hyxEY06898
L4 has eye phenotype, suppressible by hyxEY06898
Sturtevant, June 1923.
Phenotypic series: L2 > L4 > L1.