Human commercial models’ eye colour shows negativefrequency-dependent selection

In this study we investigated the eye colour of human commercial models registered in the UK (400 female and 400 male) and Brazil (400 female and 400 male) to test the hypothesis that model eye colour frequency was the result of negative frequency dependent selection. The eye colours of the models were classified as: blue, brown or intermediate. Chisquare analyses of data forcountries separated by sex showed that in the United Kingdom brown eyes and intermediate colours were significantly more frequent than expected in comparison to the general United Kingdom population (P