Dogs have only two kinds of cone cells rather than three. What does this mean for their colour vision?
ADogs see red and green but are colour blind to blue and yellow
BDogs see blue and yellow but are colour blind to red and green
CDogs see all the colours humans see, just less brightly
DDogs see no colours at all, only shades of grey
Answer & Solution
Correct answer: B. Dogs see blue and yellow but are colour blind to red and green
1. Most mammals other than primates have only two cones instead of three.
2. Dogs are given as an example: they see blue and yellow but are colour blind to red and green.
3. This is a genuine gap in colour vision, so the option claiming dogs see every colour is wrong.
4. Dogs are not fully colour blind either, since blue and yellow still register, ruling out the greyscale option.
_Source: OpenStax Physics (CC BY 4.0), Ch 15 "Light", section 15.1 The Electromagnetic Spectrum_
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