Found 2336 Hypotheses across 234 Pages (0.006 seconds)
  1. Smaller females will have a larger than expected birth canal.Betti, Lia - Human variation in the shape of the birth canal is significant and geographi..., 2018 - 2 Variables

    The 'obstetrical dilemma' postulates that human females evolved a pelvis shape that was a compromise between the needs of bipedal locomotion and the need for a wider pelvic opening. The implication is that the female pelvis should be similar across the world. Researchers examine the size and shape of the birth canal of female individuals in the Goldman and Human Origin datasets. Contrary to the 'obstetrical dilemma,' the findings reveal that there is indeed significant geographical variation in size and shape of the female birth canal. Neutral evolutionary processes, particularly genetic drift, were suggested to be influential in female canal shape whereas the predicted effects of climate on canal diversity were only minimal.

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  2. Contrary to the 'obstetrical dilemma,' there will be geographical variation in the shape of the female birth canal.Betti, Lia - Human variation in the shape of the birth canal is significant and geographi..., 2018 - 2 Variables

    The 'obstetrical dilemma' postulates that human females evolved a pelvis shape that was a compromise between the needs of bipedal locomotion and the need for a wider pelvic opening. The implication is that the female pelvis should be similar across the world. Researchers examine the size and shape of the birth canal of female individuals in the Goldman and Human Origin datasets. Contrary to the 'obstetrical dilemma,' the findings reveal that there is indeed significant geographical variation in size and shape of the female birth canal. Neutral evolutionary processes, particularly genetic drift, were suggested to be influential in female canal shape whereas the predicted effects of climate on canal diversity were only minimal.

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  3. There is less phenotypic diversity of the female birth canal with greater distance from sub-Saharan Africa.Betti, Lia - Human variation in the shape of the birth canal is significant and geographi..., 2018 - 2 Variables

    The 'obstetrical dilemma' postulates that human females evolved a pelvis shape that was a compromise between the needs of bipedal locomotion and the need for a wider pelvic opening. The implication is that the female pelvis should be similar across the world. Researchers examine the size and shape of the birth canal of female individuals in the Goldman and Human Origin datasets. Contrary to the 'obstetrical dilemma,' the findings reveal that there is indeed significant geographical variation in size and shape of the female birth canal. Neutral evolutionary processes, particularly genetic drift, were suggested to be influential in female canal shape whereas the predicted effects of climate on canal diversity were only minimal.

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  4. There is a relationship between genetic and phenotypic distance between populations.Betti, Lia - Human variation in the shape of the birth canal is significant and geographi..., 2018 - 2 Variables

    The 'obstetrical dilemma' postulates that human females evolved a pelvis shape that was a compromise between the needs of bipedal locomotion and the need for a wider pelvic opening. The implication is that the female pelvis should be similar across the world. Researchers examine the size and shape of the birth canal of female individuals in the Goldman and Human Origin datasets. Contrary to the 'obstetrical dilemma,' the findings reveal that there is indeed significant geographical variation in size and shape of the female birth canal. Neutral evolutionary processes, particularly genetic drift, were suggested to be influential in female canal shape whereas the predicted effects of climate on canal diversity were only minimal.

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  5. Human sexual dimorphism of stature will be associated with latitude category (409, 413).Wolfe, Linda D. - Latitude and intersocietal variation of human sexual dimorphism of stature, 1982 - 2 Variables

    This article examines the relationship between sexual dimorphism of stature and latitude; data support the association. The authors also find support for an association between latitude and human marriage systems, a variable proposed by Alexander (1979) to explain variation in sexual dimorphism of stature. When societies are categorized by latitude, the relationships between marriage systems and sexual dimorphism do not reach significance. Overall the authors emphasize the influence of environmental adaptation on sexual dimorphism rather than an explanation solely focused on male-male competition.

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  6. The global pattern of mandibular morphology variation will be associated with dichotomized (hunter/gatherer vs. agricultural/pastoralist) subsistence type (19546).von Cramon-Taubadel, Noreen - Global human mandibular variation reflects differences in agricultural and h..., 2011 - 2 Variables

    The researchers test the relationship between global mandibular morphology variation and susbsistence economy, population history, geography, and climate. While some mandibular variation is significantly correlated with geography, the most significant relationship is with subsistence activity. The strength of the relationship leads the authors to speculate on how masticatory behavior might have affected jaw shape, either through stress, weaning behavior, or other demographic factors.

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  7. Global mandibular morphological variation will be associated with geographic distance (19546).von Cramon-Taubadel, Noreen - Global human mandibular variation reflects differences in agricultural and h..., 2011 - 2 Variables

    The researchers test the relationship between global mandibular morphology variation and susbsistence economy, population history, geography, and climate. While some mandibular variation is significantly correlated with geography, the most significant relationship is with subsistence activity. The strength of the relationship leads the authors to speculate on how masticatory behavior might have affected jaw shape, either through stress, weaning behavior, or other demographic factors.

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  8. The degree of sexual dimorphism of stature will be associated with the degree of polygyny in human societies (434).Alexander, Richard D. - Sexual dimorphisms and breeding systems in pinnipeds, ungulates, primates, a..., 1979 - 2 Variables

    This study examines the relationship between sexual dimorphism and degree of polygyny. Authors test this relationship in both humans and non-human species. In non-human species, every correlation between sexual dimorphism (measured by body length) and degree of polygyny was significant. In human populations, sexual dimporhism was not related to degree of polygyny, however, there were some differences between populations with socially imposed monogomy and those with ecologically imposed monogamy.

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  9. Technological complexity is positively associated with risk of resource failure (1).Collard, Mark - Risk, mobility or population size?: Drivers of technological richness among ..., 2013 - 6 Variables

    This paper builds off previous research into the effect of population size and resource risk on complexity of subsistence technology by investigating the relationship between these independent variables and total number of material items and techniques used by various western North American hunter-gatherer groups. This tally of total technological complexity is found to be insignificantly related to population size or residential mobility; however, there is a significant correlation in the expected direction between technological complexity and one measure of resource risk (mean annual temperature during driest month). Tying this finding to previous analyses of subsistence technologies, the authors theorize that environmental risk is a pervasive driver of technological ingenuity and cultural evolution.

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  10. Controlling for genetics, climate, and nutrition, infant stress will be significantly related to adult male height (361).Landauer, Thomas K. - Correlates and consequences of stress in infancy, 1981 - 5 Variables

    This study is a continuation of previous research on the relationship between stress during infancy and adult height. With a better understanding of the stressors that infants experience and their effects, the authors test whether the relationship between stress and adult height remains significant when accounting for other environmental factors that may influence adult height. Results suggest that the relationship between infant stress and adult height does remain significant. Findings also show a relationship between infant stress and age at menarche.

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