Mitchell R J
Ann Hum Biol. 1977 Nov;4(6):577-9. doi: 10.1080/03014467700002571.
The frequencies of red-green colour-blind males in the indigenous population of two regions of Britain, the Isle of Man (5.6 per cent) and Cumbria (5.0 per cent), do not readily fit into the pattern of a SW-NE gradient in the frequency of the colour-blind gene in Britain suggested by earlier studies. Frequencies of red-green colour-blind females are also given for these two populations.
在英国两个地区，即马恩岛（5.6%）和坎布里亚郡（5.0%）的原住民中，红绿色盲男性的比例与早期研究提出的英国色盲基因频率呈西南 - 东北梯度分布模式并不完全相符。文中还给出了这两个人群中红绿色盲女性的比例。
