Evolutionary theories generally concur that sexual reproduction and genetic recombination evolved to maximize genetic variability. Thus, the existence of monozygotic (MZ) twins, which do not take advantage of genetic recombination for each offspring, poses a puzzle. Evolutionary logic of inclusive fitness suggests that parents with high-quality genes may be more likely to produce MZ twins. Analyses of data from the National Longitudinal Study of Adolescent to Adult Health show that MZ twins were significantly more physically attractive and healthier than dizygotic (DZ) twins and singletons. These results suggest that MZ twins may possess higher-quality genes than DZ twins and singletons, and support one of the first evolutionary theories of MZ twinning that specifies its ultimate functions.

中文翻译：

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单卵双胞胎是否比双卵双胞胎和单胞胎具有更高的遗传质量？吸引力等级和自我报告的健康提示

进化论理论普遍认为，有性生殖和遗传重组是为了最大化遗传变异而进化的。因此，单卵双生子（MZ）双胞胎的存在，不利用每个后代的基因重组，构成了一个难题。包容性适应的进化逻辑表明，具有高质量基因的父母可能更可能产生MZ双胞胎。对青少年到成人健康的国家纵向研究的数据分析表明，MZ双胞胎比同卵双胎（DZ）双胞胎和单胎双胞胎在身体上更具吸引力并且更健康。这些结果表明，MZ孪生可能比DZ孪生和单身拥有更高质量的基因，并且支持MZ孪生的最早进化论理论之一，该理论阐明了其最终功能。