Williams G O, Hughes A E
Am J Phys Anthropol. 1987 Mar;72(3):399-401. doi: 10.1002/ajpa.1330720312.
A sample of 1,600 unrelated individuals in Lagos (Nigeria) were examined for attached or free ear lobes. Pedigree data were obtained for 11 families by questionnaire. The corrected proportion of attached among the progeny of free X free was 0.27 compared to an expected value of 0.25. The observed frequencies of the three types of marriages were not significantly different from the expected values derived from the frequencies of the traits in the population. Males and females in the population were equally affected by the traits. Thus, the population frequency of attached is 25.37%, a value within the range for Caucasoids but lower than for Mongoloids.
在拉各斯（尼日利亚）对1600名无亲缘关系的个体进行了耳垂附着或游离情况的检查。通过问卷调查获得了11个家庭的系谱数据。在游离耳垂×游离耳垂的后代中，附着耳垂的校正比例为0.27，而预期值为0.25。三种婚姻类型的观察频率与根据人群中性状频率得出的预期值没有显著差异。人群中的男性和女性受这些性状的影响程度相同。因此，附着耳垂的人群频率为25.37%，该值在高加索人种的范围内，但低于蒙古人种。
