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Frequency of twinning in two Costa Rican ethnic groups: An update

2001; Wiley; Volume: 13; Issue: 2 Linguagem: Inglês

10.1002/1520-6300(200102/03)13

1520-6300

Lorena Madrigal, German Sáenz, M. Colas Chavez, Dale D. Dykes,

Botanical Research and Chemistry

American Journal of Human BiologyVolume 13, Issue 2 p. 220-226 Original Article Frequency of twinning in two Costa Rican ethnic groups: An update L. Madrigal, Corresponding Author L. Madrigal [email protected] Department of Anthropology, University of South Florida, Tampa, FloridaDepartment of Anthropology, University of South Florida, Tampa, FL 33620Search for more papers by this authorG. Saenz, G. Saenz Universidad de Costa Rica (CIHATA), San Jose, Costa RicaSearch for more papers by this authorM. Chavez, M. Chavez Universidad de Costa Rica (CIHATA), San Jose, Costa RicaSearch for more papers by this authorD. Dykes, D. Dykes Minneapolis War Memorial Blood Bank, Minneapolis, Minnesota D. Dykes, posthumously; at the time of data analysis, he was at the Minneapolis War Memorial Blood Bank, Minneapolis, MN. See Crawford (1991) for an obituary.Search for more papers by this author L. Madrigal, Corresponding Author L. Madrigal [email protected] Department of Anthropology, University of South Florida, Tampa, FloridaDepartment of Anthropology, University of South Florida, Tampa, FL 33620Search for more papers by this authorG. Saenz, G. Saenz Universidad de Costa Rica (CIHATA), San Jose, Costa RicaSearch for more papers by this authorM. Chavez, M. Chavez Universidad de Costa Rica (CIHATA), San Jose, Costa RicaSearch for more papers by this authorD. Dykes, D. Dykes Minneapolis War Memorial Blood Bank, Minneapolis, Minnesota D. Dykes, posthumously; at the time of data analysis, he was at the Minneapolis War Memorial Blood Bank, Minneapolis, MN. See Crawford (1991) for an obituary.Search for more papers by this author First published: 01 February 2001 https://doi.org/10.1002/1520-6300(200102/03)13:2 3.0.CO;2-7Citations: 6 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Variation in the frequency of twinning among human populations has been presumed to reflect genetic differences. It has been commonly reported that populations of African ancestry have the highest, those of Asian ancestry the lowest, and those of European and Middle-Eastern ancestry intermediate frequencies of twinning. Populations from the Americas have been reported to have intermediate twinning frequencies, presumably reflecting their admixture. In this context, Madrigal (1994. Am J Hum Biol 6:215–218) reported virtually identical (and high) twinning frequencies in two Costa Rican ethnic groups, one of African, the other of Euro-Amerindian ancestry. These frequencies were interpreted in light of frequent inter-ethnic unions, and it was predicted that the two groups would not differ substantially in gene frequencies of several blood enzyme systems. This paper reports the gene frequencies of both groups for such systems. The samples differ significantly for systems that have clearly different frequencies in African and European populations. Given that the groups are actually different in gene frequencies and not homogenous as predicted earlier, the conclusion that twinning frequencies are similar as a result of a similar genetic make up can be questioned. The results challenge the assumption that if populations have similar twinning frequencies it is because they are genetically similar and argue for a stronger environmental component for twinning frequencies. Am. J. Hum. Biol. 13:220–226, 2001. © 2001 Wiley-Liss, Inc. LITERATURE CITED Barrantes R, Smouse PE, Neel JV, Mohrenweiser HW, Gershowitz H. 1982. Migration and genetic infrastructure of the central American Guaymi and their affinities with other tribal groups. Am J Phys Anthropol 58: 201–214. 10.1002/ajpa.1330580213 PubMedWeb of Science®Google Scholar Bortolus R, Parazzini F, Chatenoud L, Benzi G, Bianchi M, Marini A. 1999. The epidemiology of multiple births. 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