Reed T, Evans M M, Norton J A, Christian J C
Am J Hum Genet. 1979 May;31(3):315-23.
Significantly larger variation between sibships within families of male MZ twins than between sibships within families of female MZ twins, indicative of maternal influences, was found for 10 of 41 dermatoglyphic fingertip variables. Of these, five were thumb-related with the effect primarily on the thumb radial and ridge count (larger of radial and ulnar count). These same variables were previously found to have unequal variances in MZ twins of known placental type, and the results indicate maternal influences in singletons as well as twins for these variables. Although the total ridge count (TRC), previously shown to differ in MZ twins of known placental type (paralleling the thumb radial and ridge counts) did not reach significance, the trend indicated that the observed thumb changes may be reflected in the TRC as well. Little finger pattern type and ulnar counts also showed less variability in families of female MZ twins, but the interpretation is complicated by the concomitant differences in mean squares within-sibships for these little finger variables.
在41个肤纹指尖变量中的10个变量上，发现男性同卵双胞胎家庭中不同同胞组之间的差异显著大于女性同卵双胞胎家庭中不同同胞组之间的差异，这表明存在母体影响。其中，有5个与拇指相关，主要影响拇指桡侧和嵴纹计数（桡侧和尺侧计数中较大者）。之前发现，在已知胎盘类型的同卵双胞胎中，这些相同的变量具有不等的方差，结果表明这些变量在单胎以及双胞胎中均受母体影响。尽管之前显示已知胎盘类型的同卵双胞胎的总嵴纹计数（TRC）存在差异（与拇指桡侧和嵴纹计数情况相似），但未达到显著水平，不过该趋势表明观察到的拇指变化可能也反映在总嵴纹计数上。小指纹型和尺侧计数在女性同卵双胞胎家庭中也显示出较小的变异性，但由于这些小指变量在同胞组内的均方存在伴随差异，其解释变得复杂。
