Answers are grounded in this paper and cite their sources.
We identified the causal genetic variation for the difference in the thoracic trident pigmentation intensity between two wild-derived strains of Drosophila melanogaster. It was found to be the difference in expression level of ebony, which codes for an enzyme in the melanin-synthesis pathway and has pleiotropic effects on vision and behavior.
No takes yet. Share an insight, caveat, or question.
Takahashi et al. (2007) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: