Browsing Research Articles (Genetics) by UP Author "Greeff, Jaco M. (Jacobus Maree)"

Browsing Research Articles (Genetics) by UP Author "Greeff, Jaco M. (Jacobus Maree)"

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  • African perceptions of female attractiveness 
    Coetzee, Vinet; Faerber, Stella J.; Greeff, Jaco M. (Jacobus Maree); Lefevre, Carmen E.; Re, Daniel E.; Perrett, David Ian; Yovel, Galit (Public Library of Science, 2012-10-29)
    Little is known about mate choice preferences outside Western, educated, industrialised, rich and democratic societies, even though these Western populations may be particularly unrepresentative of human populations. To ...
  • Allele frequencies of AVPR1A and MAOA in the Afrikaner population 
    Erasmus, J.C. (Johannes Christoff); Klingenberg, Anton; Greeff, Jaco M. (Jacobus Maree) (AOSIS OpenJournals, 2015-07)
    The Afrikaner population was founded mainly by European immigrants that arrived in South Africa from 1652. However, female slaves from Asia and Africa and local KhoeSan women may have contributed as much as 7% to this ...
  • Appel Botha Cornelitz : the abc of a three hundred year old divorce case 
    Greeff, Jaco M. (Jacobus Maree); Erasmus, J.C. (Johannes Christoff) (Elsevier, 2013)
    In 1683 Maria Kickers and Jan Cornelitz got married in Cape Town. Today, 330 years later, the living patrilineal descendants of Maria’s four sons, number in excess of 76,000 people. Curiously, none of them carry the ...
  • Common HLA Alleles associated with health, but not with facial attractiveness 
    Coetzee, Vinet; Barrett, Louise; Greeff, Jaco M. (Jacobus Maree); Henzi, S. Peter; Perrett, David Ian; Wadee, Ahmed A. (Public Library of Science, 2007-07)
    Three adaptive hypotheses have been proposed to explain the link between the human leucocyte antigen (HLA) genes, health measures and facial attractiveness: inbreeding avoidance, heterozygote advantage and frequency-dependent ...
  • A comparative approach to understanding factors limiting abundance patterns and distributions in a fig tree–fig wasp mutualism 
    Warren, Marie; Robertson, Mark P.; Greeff, Jaco M. (Jacobus Maree) (Wiley-Blackwell, 2010-02)
    Numerous factors affect distribution and abundance. Due to their intimate host association, pollinating fig wasps are expected to occupy the entire distribution of their host fig. An understanding of the physiology of fig ...
  • Conservation implications of fine scale population genetic structure of Ficus species in South African forests 
    Deng, Jun-Yin; Van Noort, Simon; Compton, Stephen G.; Chen, Yan; Greeff, Jaco M. (Jacobus Maree) (Elsevier, 2020-10)
    Genetic considerations are rarely applied in forest conservation management strategies, but forest fragmentation can reduce pollen and seed dispersal both between and within isolated fragments. Gene flow and immigration ...
  • Consistently high incidence of Wolbachia in global fig wasp communities 
    Ahmed, Muhammad Zaheerudin; Greyvenstein, Ockert F.C.; Erasmus, Christoff; Welch, John J.; Greeff, Jaco M. (Jacobus Maree) (Wiley-Blackwell, 2013-04)
    1. Wolbachia are very common and widespread endosymbionts of arthropods. They can have a considerable effect on their host's fitness. It has been estimated that as many as 40% of arthropod species are infected with ...
  • Cross-cultural agreement in facial attractiveness preferences : the role of ethnicity and gender 
    Coetzee, Vinet; Greeff, Jaco M. (Jacobus Maree); Stephen, Ian D.; Perrett, David Ian (Public Library of Science, 2014-07-02)
    Previous work showed high agreement in facial attractiveness preferences within and across cultures. The aims of the current study were twofold. First, we tested cross-cultural agreement in the attractiveness judgements ...
  • Deconstructing Jaco : genetic heritage of an Afrikaner 
    Greeff, Jaco M. (Jacobus Maree) (Blackwell, 2007-09)
    It is often assumed that Afrikaners stem from a small number of Dutch immigrants. As a result they should be genetically homogeneous, show founder effects and be rather inbred. By disentangling my own South African pedigree, ...
  • Evidence for horizontal transmission of secondary Endosymbionts in the Bemisia tabaci cryptic species complex 
    Ahmed, Muhammad Zaheerudin; De Barro, P.J. (Paul Joseph), 1963-; Ren, Shun-Xiang; Greeff, Jaco M. (Jacobus Maree); Qiu, Bao-Li (Public Library of Science, 2013-01-07)
    Bemisia tabaci (Hemiptera: Aleyrodidae) is a globally distributed pest composed of at least 34 morphologically indistinguishable cryptic species. At least seven species of endosymbiont have been found infecting some or ...
  • Evolution of the scale and manner of brother competition in pollinating fig wasps 
    Nelson, Ronald Michael; Greeff, Jaco M. (Jacobus Maree) (Elsevier, 2009)
    Contest competition and male dispersal have evolved a number of times in pollinating fig wasps. Given their highly female-biased sex ratios and high relatedness between competing males, this phenomenon is surprising. ...
  • Facial-based ethnic recognition : insights from two closely related but ethnically distinct groups 
    Coetzee, Vinet; Greeff, Jaco M. (Jacobus Maree); Barrett, Louise; Henzi, S. Peter (Academy of Science of South Africa, 2009-11)
    Previous studies on facial recognition have considered widely separated populations, both geographically and culturally, making it hard to disentangle effects of familiarity with an ability to identify ethnic groups per ...
  • Few figs for frugivores : riparian fig trees in Zimbabwe may not be a dry season keystone resource 
    Compton, Stephen G.; Greeff, Jaco M. (Jacobus Maree) (Wiley, 2020-12)
    Most plants flower and fruit at times of year when probabilities of pollination and seedling establishment are high. Fig trees (Ficus spp.) are often considered as keystone resources for vertebrate frugivores, in part ...
  • The genetic consequences of habitat specificity for fig trees in southern African fragmented forests 
    Deng, Jun-Yin; Van Noort, Simon; Compton, Stephen G.; Chen, Yan; Greeff, Jaco M. (Jacobus Maree) (Elsevier, 2020-01)
    Theory predicts that fragmentation will lead to reduced gene flow between populations, with loss of genetic diversity and increased population differentiation. However, these predictions may not always hold true, especially ...
  • Genetic diversity of Amylostereum areolatum, the fungal symbiont of the invasive woodwasp Sirex noctilio in South Africa 
    Mlonyeni, X.O.M. (Xolile Osmond Mnyamezeli); Wingfield, Michael J.; Greeff, Jaco M. (Jacobus Maree); Wingfield, Brenda D.; Slippers, Bernard (Wiley, 2018-12)
    Amylostereum areolatum is a wood‐decaying homobasidiomycete fungal symbiont of Sirex noctilio. Together, they cause serious damage to pine plantations in the Southern Hemisphere. The fungus reproduces asexually and is ...
  • The influence of behaviour and physiology on abundance and distribution relationships 
    Warren, Marie; Robertson, Mark P.; Greeff, Jaco M. (Jacobus Maree) (Wiley-Blackwell, 2011)
    Abiotic factors, biotic factors and dispersal ability affect distribution and abundance. Due to their intimate host association, pollinating fig wasps are expected to occupy the entire distribution of their host fig. ...
  • Influence of reproductive biology on establishment capacity in introduced Hymenoptera species 
    Queffelec, Josephine; Allison, Jeremy D.; Greeff, Jaco M. (Jacobus Maree); Slippers, Bernard (Springer, 2021-02)
    Introduced species face numerous biological barriers before they can establish in a new environment. Understanding how they overcome these obstacles is crucial for the development of effective risk assessment and regulation. ...
  • The intracellular bacterium Wolbachia uses parasitoid wasps as phoretic vectors for efficient horizontal transmission 
    Ahmed, Muhammad Zaheerudin; Li, Shao-Jian; Xue, Xia; Yin, Xiang-Jie; Ren, Shun-Xiang; Jiggins, Francis M.; Greeff, Jaco M. (Jacobus Maree); Qiu, Bao-Li (Public Library of Science, 2015-02)
    Facultative bacterial endosymbionts are associated with many arthropods and are primarily transmitted vertically from mother to offspring. However, phylogenetic affiliations suggest that horizontal transmission must also ...
  • Low nonpaternity rate in an old Afrikaner family 
    Greeff, Jaco M. (Jacobus Maree); Greeff, Francois A.; Greeff, Andre S.; Rinken, Lucas; Welgemoed, Dawid J.; Harris, Yolanda (Elsevier, 2012-07)
    Extrapair paternity is a crucial parameter for evolutionary explanations of reproductive behavior. Early studies and human testis size suggest that human males secure/suffer frequent extrapair paternity. If these high ...
  • Mechanisms that influence sex ratio variation in the invasive hymenopteran Sirex noctilio in South Africa 
    Queffelec, Josephine; Wooding, Amy L.; Greeff, Jaco M. (Jacobus Maree); Garnas, Jeffrey R.; Hurley, Brett Phillip; Wingfield, Brenda D.; Slippers, Bernard (Wiley Open Access, 2019-07)
    Sirex noctilio is an economically important invasive pest of commercial pine forestry in the Southern Hemisphere. Newly established invasive populations of this woodwasp are characterized by highly male‐biased sex ratios ...