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Phenotypic traits of primate hybrids: Recognizing admixture in the fossil record

Ackermann, Rebecca Rogers·2010·Evolutionary Anthropology: Issues, News, and Reviews

Abstract

For many years, the likelihood that hybridization occurred in human evolution has been debated. Tattersall and Schwartz pointed out one of the core problems with resolving this debate, namely “that nobody has any idea what a Neanderthal/modern human hybrid might look like in theory, and few have dared to suggest in practice that any particular known fossil represents such a hybrid.” 1:7117 Moreover, while molecular data is proving increasingly useful for characterising hybrid zones, the utility of the phenotype for this purpose is not clear. 2 Here I address these issues, discussing both theoretical and empirically‐derived expectations for what hybrid morphology looks like, with an emphasis on the skeleton of hybrid primates, and consideration of the hominin fossil record.

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Crossref · 10.1002/evan.20288

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5 of 5 references verified0 citation errors · 0 not checkable

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  • Theoretical expectations regarding phenotypic diversity within hybrid populations predict a complex range of phenotypes including cryptic hybrids, intermediate individuals, and transgressive segregation.

    “Theoretical expectations regarding phenotypic diversity within hybrid populations predict a complex range of phenotypes that can include individuals that resemble either parental population (cryptic hybrids), those that are morphologically intermediate to parental populations, as well as individuals that display transgressive segregation (Ackermann 2010).”
  • These results support the expectation that hybrid populations are more phenotypically variable than their parental populations.

    “In short, these results also support the expectation that hybrid populations are more phenotypically variable than their parental populations (Ackermann 2010).”
  • The increased phenotypic variation in hybrids is a predictable result of allelic differences between parental taxa, as well as genome-wide dominance and epistatic effects.

    “Although the underlying genetic architecture responsible for this increased phenotypic variation is incompletely understood, it is a predictable result of allelic differences between parental taxa, as well as genome-wide dominance and epistatic effects (see discussion in Ackermann 2010).”
  • The latter leads to underestimation of actual levels of hybridization (or numbers of hybrids) within a population.

    “The latter leads to underestimation of actual levels of hybridization (or numbers of hybrids) within a population (Ackermann 2010; Kelaita and Corte ´s-Ortiz 2013).”

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Metadata

Authors
Ackermann, R. R.
Venue
Evolutionary Anthropology: Issues, News, and Reviews
Publisher
Wiley
Published
2010-11
Volume
19
Issue
6
Pages
258-270
ISSN
  • 1060-1538
  • 1520-6505
Cited by
81
References
5
Language
en

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