Found 1800 Hypotheses across 180 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. 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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  3. 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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  4. There will be a relationship between overall canal shape differences and temperature differences.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. 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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  6. 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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  7. Carrying capacity with group size limits will be a predictor of language diversity in North America.Cuelho, Mario Tulio Pacheco - Drivers of geographical patterns of North American language diversity, 2019 - 2 Variables

    The authors examine multiple ecological variables as possible predictors of language diversity in North America using path analysis, mechanistic simulation modelling, and geographically weighted regression. They conclude that many of the variables do not predict language diversity, but rather are mediated by population density. The authors also find that the variables' ability to predict is not universal across the continent, but rather more regional.

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  8. 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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  9. In societies where females have the social status to exercise mate choice, there will be lower stature sexual dimorphism (SSD), but only if there is high food security.Gleeson, Ben Thomas - Female status, food security, and stature sexual dimorphism: Testing mate ch..., 2018 - 6 Variables

    The present study examines the effect of social status on stature sexual dimorphism and whether food security acts as a mediator for this relationship. In societies where females have high social status and can exercise mate choice, there is lower stature sexual dimorphism. Food security enhances these results. Conversely, there is greater stature sexual dimorphism in societies where females have low social status and cannot exercise mate choice, especially if there is food insecurity.

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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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