Sheets J W
Ann Hum Biol. 1984 May-Jun;11(3):257-9. doi: 10.1080/03014468400007141.
A family record of 1693 descendants in rural Missouri exhibits a twinning rate of 2 X 2%. Weinberg's Differential Rule estimates the level of monozygosity in this twin sample at 61-83%, unlike previous results dominated by dizygosity . These historical data cannot directly support a genetic basis for monozygosity though. Clinical studies seem the best solution to the genetics of twinning.
一份关于密苏里州农村地区1693名后代的家族记录显示，双胞胎出生率为2×2%。温伯格差异法则估计，在这个双胞胎样本中，单卵双胞胎的比例为61%-83%，这与之前以双卵双胞胎为主的结果不同。不过，这些历史数据并不能直接支持单卵双胞胎存在遗传基础这一观点。临床研究似乎是解决双胞胎遗传学问题的最佳办法。
