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Hybrid marriages and phenotypic heterosis in offspring: Evidence from China

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  • Zhu, Chen
  • Zhang, Xiaohui
  • Zhao, Qiran
  • Chen, Qihui

Abstract

In genetics, heterosis refers to the phenomenon that cross-breeding within species leads to offspring that are genetically fitter than their parents and exhibit improved phenotypic characteristics. Based on the theory of heterosis and existing genetic evidence, offspring of “hybrid” marriages (spouses originating from different states/provinces/countries/areas), though relatively rare due to physical boundaries, may exhibit greater genetic fitness in terms of intelligence, height, or physical attractiveness (the “distance-performance” hypothesis). This study explores whether heterosis is a contributing factor to offspring’s educational attainment in China by applying a high-dimensional fixed effects (HDFE) modelling framework to the unique 0.1% micro-sample of the 2000 Chinese Population Census data. Concerning potential endogeneity of hybrid marriages, we conduct a series of robustness checks. Reassuringly, the estimated heterosis effect remains significantly positive across various measurements, after controlling for parental educational attainments/height, environmental influences, and over a thousand region and region-by-year fixed effects. The effects in male and higher-educated offspring are found to be stronger. Results are replicated when analyzing body height using data from the China Health and Nutrition Survey. Although endogeneity of “hybrid marriages” may not be completely ruled out, the current study sheds light on the potentially beneficial effects of interprovincial migration on population-level human capital accumulation, and we hope that this paper can intrigue future studies that further address endogeneity. The implied heterosis effect could, therefore, be profound for Homo sapiens as a species from an evolutionary point of view. An additional important implication is that the overall genetic influences of parents on offspring’s performance may be further decomposed into a conventional heredity effect and a heterosis effect that has been neglected previously.

Suggested Citation

  • Zhu, Chen & Zhang, Xiaohui & Zhao, Qiran & Chen, Qihui, 2018. "Hybrid marriages and phenotypic heterosis in offspring: Evidence from China," Economics & Human Biology, Elsevier, vol. 29(C), pages 102-114.
    • Handle: RePEc:eee:ehbiol:v:29:y:2018:i:c:p:102-114
    DOI: 10.1016/j.ehb.2018.02.008
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    3. Qin, Yu & Ruan, Jianqing & Wang, Ling & Yan, Jubo, 2022. "Genetic distance and intra-national variation in preferences and behaviours," Journal of Asian Economics, Elsevier, vol. 83(C).

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    More about this item

    Keywords

    Heterosis; Hybrid marriage; Genetic distance; Educational attainment; Height;
    All these keywords.

    JEL classification:

    • I00 - Health, Education, and Welfare - - General - - - General
    • I14 - Health, Education, and Welfare - - Health - - - Health and Inequality
    • J16 - Labor and Demographic Economics - - Demographic Economics - - - Economics of Gender; Non-labor Discrimination
    • J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity

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