At a glance
Roughly 8% of men and 0.5% of women in many European-ancestry samples — rates vary by study and definition. Most people have three cone types (trichromacy); rare variants add a fourth or reduce one channel — individual biology, not continental race types.
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Color vision
- Mechanism Retinal cones
- Genes Opsin loci
- Common variant Red–green deficiency
- Pattern Sex-linked skew
- Myth Not a race rank
- Design Accessibility matters
Blood groups
- Systems ABO · Rh · many
- Pattern Frequency clines
- Clinical Matching saves lives
- Forensics Weak ancestry signal
- Evolution Pathogen hypotheses
- Universal donor Context-dependent
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Color vision · Readers get the mechanism, geographic quirks of deficiency rates
Readers get the mechanism, geographic quirks of deficiency rates, and myths that turn sight into folklore about group essence. Population surveys show different frequencies of red–green deficiency in various regions — often linked to sampling, founder effects and X-linked genetics, not racial essence.
Color vision · Red–green deficiency
Roughly 8% of men and 0.5% of women in many European-ancestry samples — rates vary by study and definition. Most people have three cone types (trichromacy); rare variants add a fourth or reduce one channel — individual biology, not continental race types.
Color vision · Comparative studies show primate trichromacy evolved via gene du
Comparative studies show primate trichromacy evolved via gene duplication — a deep mammal story, not modern race splits. Meta-analyses report regional frequency differences with methodological caveats — useful for screening, useless for ranking peoples.
Color vision · Rare individuals with four cone types may discriminate extra hue
Rare individuals with four cone types may discriminate extra hues — evidence of individual variation, not continental superiority. Berlin-Kay and successors show languages categorize color differently without changing cone biology.
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Comparative studies show primate trichromacy evolved via gene duplication — a deep mammal story, not modern race splits. Meta-analyses report regional frequency differences with methodological caveats — useful for screening, useless for ranking peoples.
Does this page rank people or nations?
This describes culture, language, or population. It does not rank races or peoples. It does not replace the full topic page.
Where is the longer entry?
Rare individuals with four cone types may discriminate extra hues — evidence of individual variation, not continental superiority. Berlin-Kay and successors show languages categorize color differently without changing cone biology.