6 found

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  1.  3
    Inbreeding in Southeastern Spain.R. Calderón, C. L. Hernández, G. García-Varela, D. Masciarelli & P. Cuesta - 2018 - Human Nature 29 (1):45-64.
    In this paper, the structure of a southeastern Spanish population was studied for the first time with respect to its inbreeding patterns and its relationship with demographic and geographic factors. Data on consanguineous marriages from 1900 to 1969 were taken from ecclesiastic dispensations. Our results confirm that the patterns and trends of inbreeding in the study area are consistent with those previously observed in most non-Cantabrian Spanish populations. The rate of consanguineous marriages was apparently stable between 1900 and 1935 and (...)
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  2.  1
    Possible Balancing Selection in Human Female Homosexuality.Andrea Camperio Ciani, Umberto Battaglia, Linda Cesare, Giorgia Camperio Ciani & Claudio Capiluppi - 2018 - Human Nature 29 (1):14-32.
    A growing number of researchers suggest that female homosexuality is at least in part influenced by genetic factors. Unlike for male homosexuality, few familial studies have attempted to explore maintenance of this apparently fitness-detrimental trait in the population. Using multiple recruitment methods, we explored fecundity and sexual orientation within the pedigrees of 1,458 adult female respondents. We compared 487 homosexual and 163 bisexual with 808 heterosexual females and 30,203 of their relatives. Our data suggest that the direct fitness of homosexual (...)
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  3.  2
    Measuring the Unmeasurable.Stefan L. K. Gruijters & Bram P. I. Fleuren - 2018 - Human Nature 29 (1):33-44.
    Within evolutionary biology, life-history theory is used to explain cross-species differences in allocation strategies regarding reproduction, maturation, and survival. Behavioral scientists have recently begun to conceptualize such strategies as a within-species individual characteristic that is predictive of behavior. Although life history theory provides an important framework for behavioral scientists, the psychometric approach to life-history strategy measurement—as operationalized by K-factors—involves conceptual entanglements. We argue that current psychometric approaches attempting to identify K-factors are based on an unwarranted conflation of functional descriptions and (...)
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  4.  2
    Grandmothers and Children’s Schooling in Sub-Saharan Africa.Sandor Schrijner & Jeroen Smits - 2018 - Human Nature 29 (1):65-89.
    Under poor circumstances, co-residence of a grandmother is generally considered to be beneficial for children. Empirical evidence does not unequivocally support this expectation and suggests that the grandmother’s importance depends on the family’s circumstances. We study the relationship between grandmother’s co-residence and children’s schooling in sub-Saharan Africa under a broad range of circumstances. Results make clear that the effect of a co-residing grandmother varies but is almost always positive. Grandmothers over age 60 are most effective in helping their children. They (...)
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  5.  3
    Altruistic Behavior Among Twins.Encarnación Tornero, Juan F. Sánchez-Romera, José J. Morosoli, Alexandra Vázquez, Ángel Gómez & Juan R. Ordoñana - 2018 - Human Nature 29 (1):1-12.
    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 depending on zygosity. We (...)
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  6.  1
    Correction To: Altruistic Behavior Among Twins.Encarnación Tornero, Juan F. Sánchez-Romera, José J. Morosoli, Alexandra Vázquez, Ángel Gómez & Juan R. Ordoñana - 2018 - Human Nature 29 (1):13-13.
    The original version of this article unfortunately contained a mistake. The presentation of the article title and subtitle was incorrect.
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