UC San Diego biologists identified the genetic switch that gave butterflies an extra light-detecting cell in their eyes, expanding their colour vision beyond imagination
The researchers found that butterflies did not redesign their entire visual system. Instead, they effectively duplicated one component of the existing arrangement, adding a second R7 photoreceptor to each eye unit. A butterfly’s world is not simply brighter or more colourful than ours. It is built from a richer visual vocabulary, one shaped by an…
