Heath A C
Department of Human Genetics, Medical College of Virginia, Richmond.
Acta Genet Med Gemellol (Roma). 1987;36(1):41-9. doi: 10.1017/s0001566000004578.
The effects on twin data of social interaction between spouses is examined. When social interaction leads to an increase in marital resemblance (eg through reciprocal imitation), the variance of married individuals is increased, compared to the variance of unmarried individuals. Furthermore, the expected correlations between concordant married twin pairs will be lower than the expected correlations between concordant unmarried twin pairs, with the discordant twin correlations being intermediate in value. It is therefore possible, in principle, to detect the effects of marital interaction without using either longitudinal data or data on spouse pairs. However, to be detectable in twin data, marital interaction must be strong, or must exhibit marked asymmetry of effects between males and females. Genotype x environment interaction can also produce heterogeneity of correlation between concordant married, discordant, and concordant unmarried twin pairs, when genetic and environmental effects interact with marital status. However, this will usually produce increased estimates of the genetic component of variance in unmarried twins, whereas marital interaction produces increased genetic variance in married twins.
研究了配偶间社会互动对双胞胎数据的影响。当社会互动导致婚姻相似度增加（例如通过相互模仿）时，与未婚个体的方差相比，已婚个体的方差会增加。此外，一致的已婚双胞胎对之间的预期相关性将低于一致的未婚双胞胎对之间的预期相关性，不一致的双胞胎相关性的值则处于中间。因此，原则上有可能在不使用纵向数据或配偶对数据的情况下检测婚姻互动的影响。然而，要在双胞胎数据中被检测到，婚姻互动必须很强，或者必须在男性和女性之间表现出明显的效应不对称。当遗传和环境效应与婚姻状况相互作用时，基因型×环境相互作用也会导致一致的已婚、不一致和一致的未婚双胞胎对之间的相关性产生异质性。然而，这通常会导致未婚双胞胎中方差的遗传成分估计值增加，而婚姻互动会导致已婚双胞胎的遗传方差增加。
