Genetic Controls
The head patterning is controlled by orthodenticle, a homeobox gene which demarcates the segments from the top-middle of the head to the more lateral aspects. The ocelli are in an orthrodenticle-rich area, and the gene is not expressed by the time one gets as lateral as the compound eyes.
The gene dachshund is involved in the development of the compound eye.
Different opsins are used in the ocelli to the compound eyes.
Read more about this topic: Arthropod Eye
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