Abstract:
:Bilateral tooth measurements in twins are partitioned into three orthogonal contrasts, each associated with one degree of freedom, to estimate three parameters: discordance, asymmetry, and mirror imagery. The probability levels of the within-pair variance ratios were used to test for significance of these estimates. The results provided strong evidences for the existence of significant genetic determinants of almost all of the individual tooth dimensions, but little or no evidence for a genetic basis of asymmetry. The analysis gave no indication that monozygotic twinning was associated with an increased degree of either fluctuating asymmetry or mirror imagery, when compared to dizygotic twins. The data on monozygotic twins further suggested that for most variables examined, the increment of environmental discordance resulting from the twinning phenomena was greater than the developmental noise that caused asymmetry within individual cotwins.
journal_name
Am J Phys Anthropoljournal_title
American journal of physical anthropologyauthors
Potter RH,Nance WEdoi
10.1002/ajpa.1330440303subject
Has Abstractpub_date
1976-05-01 00:00:00pages
391-5issue
3eissn
0002-9483issn
1096-8644journal_volume
44pub_type
杂志文章abstract::Excavations at hearth levels at the Molare Shelter in 1985 yielded the mandible of a 3-4-year-old child. The associated lithic artifacts recovered with it are Mousterian. Its features, although quite archaic, are within the known range of variation of Neandertals. Four deciduous molars are still preserved in the mandi...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.1330790404
更新日期:1989-08-01 00:00:00
abstract:OBJECTIVES:The presence of Microchoerus in Sant Cugat de Gavadons (Late Eocene, Ebro Basin, Northeastern Spain) was first noted by M. Crusafont, who described a fragment of maxilla with two teeth that he interpreted as P(4) and M(1) and referred this specimen to the species Microchoerus ornatus. The objective of this w...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.22940
更新日期:2016-05-01 00:00:00
abstract::In various environments where primates are presently observed, as well as in forests and savannas which have been inhabited by australopithecines and early hominids, there are (or there have been presumably) categories of substances eliciting taste signals associated with stereotyped responses. Such is the case for va...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.10046
更新日期:2002-04-01 00:00:00
abstract:OBJECTIVES:First ribs bear information about thorax morphology and are usually well preserved, compared to other ribs, in bone/fossil samples. Several studies have addressed ontogeny of the first rib by studying changes in bone microanatomy and rib morphology separately, but no studies have combined both approaches to ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.23313
更新日期:2017-12-01 00:00:00
abstract::A histological aging study of femoral midshafts in a late Roman period sample from the Dakhleh Oasis, Egypt, showed discrete fluorochrome labelling. The fluorochrome is yellow-green in colour and fluoresces at a wavelength of 525 nm. The labelling occurs at the mineralization fronts and is so distinct that several his...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.1330800202
更新日期:1989-10-01 00:00:00
abstract::Maternal reproductive investment includes both the energetic costs of gestation and lactation. For most humans, the metabolic costs of lactation will exceed those of gestation. Mothers must balance reproductive investment in any single offspring against future reproductive potential. Among mammals broadly, mothers may...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.22346
更新日期:2013-10-01 00:00:00
abstract::The Philippines is generally believed to have been established by various peoples who migrated from neighboring areas. To gain new insights into the peopling of the Philippines, we used the JC virus (JCV) genotyping approach. We collected about 50 urine samples on each of two representative islands of the Philippines,...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.10155
更新日期:2003-02-01 00:00:00
abstract:OBJECTIVES:A "dip" in the stable nitrogen isotope ratios (δ(15)N) of subadults in the late weaning/early post-weaning phase of growth and development has been observed. Speculatively, this is the mechanism of positive nitrogen balance operating among rapidly growing subadults. An alternate hypothesis for δ(15)N dips is...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.22713
更新日期:2015-06-01 00:00:00
abstract::Sattenspiel and Harpending (1983, American Antiquity 48(3): 489-498) have stated that the life expectancy at birth (e0(0] which paleodemographers calculate from skeletal population data is actually the mean age at death (ad) of the population. Yet, only when a population is neither growing or declining (i.e., is stati...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330760207
更新日期:1988-06-01 00:00:00
abstract::In the present study the frequency of the simian crease among 57 Down patients is compared to the corresponding figures of related and unrelated individuals. A study of the correlation with the dermatoglyphic patterns of the thenar and hypothenar areas is presented, the palm print classification being carried out acco...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330720303
更新日期:1987-03-01 00:00:00
abstract::Lactation is an energy demanding phase in the reproductive cycle of female mammals. For this reason, several studies have assessed the effects of lactation on female behavior. In this study we examine the influence of lactation on the time-budgets and foraging patterns of female black howlers (Alouatta pigra) in Campe...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.21481
更新日期:2011-05-01 00:00:00
abstract::The Kolmogorov-Smirnov one-sample test is sometimes used to test seasonality in births or other annually cyclic phenomena. However, it is shown that the maximum deviation from expected (D) may differ by a factor of almost two if the cycle is initiated in different months. Thus, different results are possible from the ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330680310
更新日期:1985-11-01 00:00:00
abstract:OBJECTIVES:Great apes show considerable diversity in socioecology and life history, but knowledge of their physical growth in natural settings is scarce. We characterized linear body size growth in wild mountain gorillas from Volcanoes National Park, Rwanda, a population distinguished by its extreme folivory and accele...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.23232
更新日期:2017-07-01 00:00:00
abstract::Clinical studies of the relationship between developmental enamel defects and caries susceptibility have often produced conflicting results. This has been due in part to a failure to distinguish between different types of defects. Studies of this association in prehistoric populations have been rare. The complete deci...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.1330810105
更新日期:1990-01-01 00:00:00
abstract::Modern humans, among extant hominoids, possess a unique projecting, external nose whose basic structure is reflected in a series of skeletal features including nasal bone convexity, an internasal angle, lateral nasal aperture eversion, prominence and anterior positioning of the anterior nasal spine, an acute angle of ...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.1330750409
更新日期:1988-04-01 00:00:00
abstract::This set of cross-sectional and longitudinal data from children and young adults in certain Bougainville and Solomon Islands populations undergoing rapid modernization during the period 1966-1986 reveals very different responses to essentially the same stimuli-the introduction and widespread availability of western di...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.22141
更新日期:2012-11-01 00:00:00
abstract::Three-dimensional (3D) trapezium models from Homo sapiens, Gorilla gorilla, Pan troglodytes, Australopithecus afarensis (A.L.333-80), and Homo habilis (O.H.7-NNQ) were acquired through laser digitizing. Least-square planes were generated for each articular surface, and the angles between the planes were compared. Each...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.10235
更新日期:2003-10-01 00:00:00
abstract::Mummies are human remains with preservation of nonbony tissue. Mummification by natural influences results in so-called natural mummies, whereas mummification induced by active (human) intervention results in so-called artificial mummies, although many cultures practiced burial rites, which to some degree involved bot...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章,评审
doi:10.1002/ajpa.20728
更新日期:2007-01-01 00:00:00
abstract::This paper describes the development of a knuckle walking mode of locomotion by a free-living yellow baboon (Papio cynocephalus). Some implications of this occurrence for theories of the evolution of knuckle walking are discussed. ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330430217
更新日期:1975-09-01 00:00:00
abstract::Previous studies of the correlations between the languages spoken by human populations and the genes carried by the members of those populations have been limited by the small amount of genetic markers available and by approximations in the treatment of linguistic data. In this study we analyzed a large collection of ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.20622
更新日期:2007-08-01 00:00:00
abstract::The mean cranial capacities of 50 male and 50 female Zulu crania were found to be 1373.3 +/- 107.4 ml for males and 1251.2 +/- 101.1 ml for females (means +/- SD). The male value resembles that of other Negro groups, while the female value is somewhat higher than the value for Negro crania as a whole. The index of sex...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330710304
更新日期:1986-11-01 00:00:00
abstract::We analysed the frequency of six Y-specific polymorphisms in 105 Amerindian males from seven different populations, 42 Caucasian males, and a small number of males of African, Chinese, and Melanesian origin. The combination of three of the six polymorphisms studied produced four different Y-haplogroups. The haplogroup...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/(SICI)1096-8644(199701)102:1<79::AID-AJPA7
更新日期:1997-01-01 00:00:00
abstract:OBJECTIVES:Growth standards and references currently used to assess population and individual health are derived primarily from urban populations, including few individuals from indigenous or subsistence groups. Given environmental and genetic differences, growth may vary in these populations. Thus, there is a need to ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.23128
更新日期:2017-03-01 00:00:00
abstract::Familial similarity of the dermatoglyphic trait values of finger ridge-count scores and pattern intensity index is examined for 125 nuclear families from the Velanadu Brahmin population of Southern India by the method of association arrays. This methodology assesses parent-offspring and sibship similarity through a co...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330620405
更新日期:1983-12-01 00:00:00
abstract::Lactase persistence (LP) is the phenotypic trait in which lactase secretion is maintained during adulthood. LP is due to mutations in the LCT enhancer region, located 14-kb upstream of the gene. In Europeans, the -13910*T allele is associated with LP. In Africans this allele is rare while other mutations in this same ...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.22010
更新日期:2012-03-01 00:00:00
abstract::There are numerous structural defects that occur in primate teeth due to variable calcification during certain growth stages. These interruptions are usually areas of hypomineralization in enamel and dentin which are referred to as Striae of Retzius and Hunter Shreger bands in the enamel or Incremental Lines of von Eb...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330430103
更新日期:1975-07-01 00:00:00
abstract:OBJECTIVES:The arrival of the Huns into Europe in the fourth century AD increased the occurrence of intentional cranial modification among European nomads. It has been postulated that the Huns used a two-bandage cranial binding technique to differentiate themselves from surrounding nomadic groups, including those from ...
journal_title:American journal of physical anthropology
pub_type: 历史文章,杂志文章
doi:10.1002/ajpa.23412
更新日期:2018-05-01 00:00:00
abstract::Hand radiograms for osseographic assessment of bone aging status were taken from more than 7,500 individuals residing in 31 different localities and belonging to 20 ethnic groups. Multiple regression analysis was used to evaluate possible associations between bone aging parameters and several climatic factors, to wit:...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/(SICI)1096-8644(199807)106:3<349::AID-AJPA
更新日期:1998-07-01 00:00:00
abstract::Interdisciplinary research has benefitted the fields of anthropology and engineering for decades: a classic example being the application of material science to the field of feeding biomechanics. However, after decades of research, discordances have developed in how mechanical properties are defined, measured, calcula...
journal_title:American journal of physical anthropology
pub_type: 杂志文章,评审
doi:10.1002/ajpa.22903
更新日期:2016-01-01 00:00:00
abstract::Linkage disequilibria are estimated for three 2-locus systems in 18 samples from Bougainville Island, Solomon Islands. The systems are haptoglobin, acid phosphatase and MN blood group. The disequilibria are estimated two ways: by maximum likelihood (ML) and by the covariance between the non-alleles. Though seven of th...
journal_title:American journal of physical anthropology
pub_type: 杂志文章
doi:10.1002/ajpa.1330480305
更新日期:1978-03-01 00:00:00