Found 3378 Hypotheses across 338 Pages (0.006 seconds)
  1. There is positive selection for high lactose digestion capacity among adults in populations living in high-latitude, low-sunshine environments (615).Holden, Clare - Phylogenetic analysis of the evolution of lactose digestion in adults, 1997 - 2 Variables

    The ability of adults to digest lactose is common only in populations of European and circum-Mediterranean origin, a distribution thought to be a result of genetic adaptation to drinking milk from domestic livestock. Two additional hypotheses have been proposed to explain the distribution of high lactose digestion capacity: (1) supplemental calcium in high-latitude populations prone to vitamin D deficiency and (2) maintenance of water and electrolytes in the body in highly arid environments. However, these hypotheses are confounded by the shared ancestry of populations whose lactose digestion capability has been tested. Therefore, the authors test all three hypotheses using a phylogenetic comparative method for 62 cultures.

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  2. High lactose digestive capacity among adults evolved in populations that kept livestock (615).Holden, Clare - Phylogenetic analysis of the evolution of lactose digestion in adults, 1997 - 2 Variables

    The ability of adults to digest lactose is common only in populations of European and circum-Mediterranean origin, a distribution thought to be a result of genetic adaptation to drinking milk from domestic livestock. Two additional hypotheses have been proposed to explain the distribution of high lactose digestion capacity: (1) supplemental calcium in high-latitude populations prone to vitamin D deficiency and (2) maintenance of water and electrolytes in the body in highly arid environments. However, these hypotheses are confounded by the shared ancestry of populations whose lactose digestion capability has been tested. Therefore, the authors test all three hypotheses using a phylogenetic comparative method for 62 cultures.

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  3. Pastoralism is always adopted prior to the development of high lactose digestion capacity among adults (615).Holden, Clare - Phylogenetic analysis of the evolution of lactose digestion in adults, 1997 - 2 Variables

    The ability of adults to digest lactose is common only in populations of European and circum-Mediterranean origin, a distribution thought to be a result of genetic adaptation to drinking milk from domestic livestock. Two additional hypotheses have been proposed to explain the distribution of high lactose digestion capacity: (1) supplemental calcium in high-latitude populations prone to vitamin D deficiency and (2) maintenance of water and electrolytes in the body in highly arid environments. However, these hypotheses are confounded by the shared ancestry of populations whose lactose digestion capability has been tested. Therefore, the authors test all three hypotheses using a phylogenetic comparative method for 62 cultures.

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  4. In past Bantu-speaking cultures, matriliny and cattle will have a relationshipHolden, Clare Janki - Spread of cattle led to the loss of matrilineal descent in Africa: a coevolu..., 2003 - 3 Variables

    Through phylogenetic comparison, Holden and Mace explore the relationship between descent and cattle among a sample of 68 Bantu/Bantoid-speaking populations in Africa. The authors posit that when matrilineal cultures adopt cattle, they become patrilineal. Possible theories are offered to explain trends and variation in the data.

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  5. The adoption of cattle will be associated with the loss of matrilinyHolden, Clare Janki - Spread of cattle led to the loss of matrilineal descent in Africa: a coevolu..., 2003 - 4 Variables

    Through phylogenetic comparison, Holden and Mace explore the relationship between descent and cattle among a sample of 68 Bantu/Bantoid-speaking populations in Africa. The authors posit that when matrilineal cultures adopt cattle, they become patrilineal. Possible theories are offered to explain trends and variation in the data.

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  6. Sexual dimorphism in stature will be greater in polygynous societies (27).Holden, Clare - Sexual dimorphism in stature and women's work: a phylogenetic cross-cultural..., 1999 - 2 Variables

    This article presents a phylogenetic approach to studying sexual dimorphism of stature. Results show a significant association between sexual division of labor and sexual dimorphism of stature.

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  7. Sexual dimorphism in stature will be associated with variation in the sexual division of labor (27).Holden, Clare - Sexual dimorphism in stature and women's work: a phylogenetic cross-cultural..., 1999 - 2 Variables

    This article presents a phylogenetic approach to studying sexual dimorphism of stature. Results show a significant association between sexual division of labor and sexual dimorphism of stature.

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  8. There will be an association between type of subsistence and sexual dimorphism of stature (27).Holden, Clare - Sexual dimorphism in stature and women's work: a phylogenetic cross-cultural..., 1999 - 2 Variables

    This article presents a phylogenetic approach to studying sexual dimorphism of stature. Results show a significant association between sexual division of labor and sexual dimorphism of stature.

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  9. Population-level variation in DRD4 alleles is a result of the distributions of DRD4 alleles in founder groups (317).Chen, Chuansheng - Population migration and the variation of dopamine D4 receptor (DRD4) allele..., 1999 - 2 Variables

    Dopamine receptor D4 (DRD4) exhibits the largest number of polymorphisms of any dopamine receptor yet identified, and variation in DRD4 has been linked to variation in traits such as novelty-seeking and attention deficit/hyperactivity disorder. DRD4 also exhibits large variation between populations. Here, the authors test the hypothesis that natural selection acting on DRD4 may account for variation in between-population migratory patterns, using genetic and historical data from 39 populations.

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  10. Population level variation in DRD4 alleles is attributable to general bottleneck effects that also acted on non-DRD4 genes (317).Chen, Chuansheng - Population migration and the variation of dopamine D4 receptor (DRD4) allele..., 1999 - 2 Variables

    Dopamine receptor D4 (DRD4) exhibits the largest number of polymorphisms of any dopamine receptor yet identified, and variation in DRD4 has been linked to variation in traits such as novelty-seeking and attention deficit/hyperactivity disorder. DRD4 also exhibits large variation between populations. Here, the authors test the hypothesis that natural selection acting on DRD4 may account for variation in between-population migratory patterns, using genetic and historical data from 39 populations.

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