Leeds, West Yorkshire, United Kingdom of Great Britain and Northern Ireland
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    Altruistic Behavior among Twins Willingness to Fight and Self-Sacrifice for their Closest Relatives
    with Encarnación Tornero, Juan F. Sánchez-Romera, Alexandra Vázquez, Ángel Gómez, and Juan R. Ordoñana
    Human Nature 1-12. forthcoming.
    According to kin selection theory, indirect reproductive advantages may induce individuals to care for others with whom they share genes by common descent, and the amount of care, including self-sacrifice, will increase with the proportion of genes shared. Twins represent a natural situation in which this hypothesis can be tested. Twin pairs experience the same early environment because they were born and raised at the same time and in the same family but their genetic relatedness differs depend…Read more