Imagine a species that was born with only 2 cones in the retina sensitive to colour-one in the red range and one in the blue range. We would predict that colour vision in this species would be most similar to a

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Dichromats have two types of cone cells in their retinas, allowing them to see two primary colors. A species with two cones sensitive to red and blue would have a similar color vision to dichromats, who typically can see colors but have a limited range compared to trichromats, who have three types of cones.

Imagine a Species That Was Born with Only 2 Cones