Francis C Lees
Dados Biográficos
| ID | 78750 |
|---|---|
| NOME | Francis C Lees |
| PRENOMES | Francis C |
| SOBRENOME | Lees |
| ASSINATURA | LEES F C |
| AFILIAÇÕES | University at Albany, State University of New York |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 14 |
| TOTAL DE CITAÇÕES | 120 |
| TOTAL COMO AUTOR | 14 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1974 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 1985 |
| ÍNDICE H | 7 |
Sex and Age Variation in the Skin Color of Irish Children
Genetic implications of return migration
Comparison of birthplaces of parents and offspring in Longford, Ireland, shows a high proportion of offspring with birthplaces outside of Ireland. Upon closer examination it was found that the majority of these children had parents who themselves were born in Ireland. These findings indicate a high rate of return migration, whereby an emigrant returns to his/her place of origin. These findings have three genetic implications: (1) Return migration…
The use of quantitative traits in the study of human population structure
Studies of human population structure and history have tended to use demographic and/or serological data for analysis. This paper reviews the methods and studies that incorporate quantitative traits (usually polygenic traits) in such analyses. Methods of assessing the degree and pattern of among-group variation are discussed, and are characterized as being model-free or model-bound. Model-free methods deal with the measure of overall populational…
Skin colorimetry in Belize. II. Inter‐ and intra‐population variation
Skin colorimetry readings taken in Belize, Central America (formerly British Honduras) with the two most commonly used portable reflectometers reveal significant differences in mean reflectance between Garifuna (Black Caribs) and Creoles, and between Garifuna in two settlements. These differences are related to variation in African, Indian, and European admixture, as estimated from serological markers. Sex differences are not evident in univariat…
Estimating the number of loci determining skin colour in a hybrid population
A model developed by Stern to estimate the number of loci determining human skin colour in African-European hybrid populations is tested on recently collected reflectance data. Despite improved measurement scales and admixture estimates, and the use of statistical goodness-of-fit tests, contradictory results are obtained. It is shown that previous authors' use of visual inspection to compare expected and observed phenotype distributions introduce…
Population structure and anthropometric variation in rural western Ireland
The study of human population structure allows the assessment of cultural and historical influences on mating probabilities, and, hence, genetic variation. A commonly used model is isolation by distance, which predicts a negative exponential relationship between genetic similarity and geographic distance. Anthropometric data collected during the 1930's for 261 adult women in 12 towns of rural western Ireland were used to test the isolation by dis…
The effects of aging and secular trend on adult stature in rural western Ireland
Cross‐sectional data, consisting of anthropometric measurements for 347 adult males and 261 adult females in western Ireland measured during the 1930s, were used to determine the effects of aging and secular change upon stature. Estimates of statural loss due to aging were obtained using partial regression of stature on age while controlling for subischial length, and regression of the difference between observed stature and maximum predicted sta…
Admixture and skin color in the transplanted Tlaxcaltecan population of Saltillo, Mexico
Ethnohistoric accounts and serological analyses have documented the genetic effects of transplantation and admixture of several subpopulations of Tlaxcaltecans in Saltillo, Mexico. Interpopulational affinities are assessed using skin reflectance readings taken at the upper inner arm site with a Photovolt Model 670 reflectance spectrophotometer for these groups, focusing on the barrios of La Minita and Chamizal. Genetic distance analyses based on …
Population structure and anthropometric variation in rural western Ireland
Models of population structure can be investigated using data on anthropometric variation among local populations. Anthropometric data collected by Dupertuis and Dawson during the 1930s were analysed from 347 males and 261 females in 12 towns in three counties of western Ireland. We hypothesized that recent migration would decrease the degree of among-group variation. To test this hypothesis, two additional samples were created by excluding known…
New conversion formulae for light‐skinned populations using Photovolt and E.E.L. Reflectometers
Recent research in Belize revealed that published conversion coefficients for use between the two most commonly used reflectance spectro‐photometers were inadequate when applied to dark‐skinned populations. New research in Ireland shows that the published conversion coefficients for light‐skinned populations are also inadequate. A total of 320 school children from Longford, Ireland were measured for skin reflectances at the upper inner arm site w…
Skin colorimetry in belize. I. Conversion formulae
Comparisons between skin colorimetry reports have been hampered by the common use of two different types of portable reflectometers, which sample reflectances at different wavelengths. In an attempt to provide direct comparability between the two machines, multiple linear regression equations were derived from reflectance spectrophotometry readings on 308 Black Caribs and 175 Creoles in Belize, Central America, using both machines. Cross validati…
Admixture estimation using skin reflectance data
Several different methods are suggested for the estimation of admixture proportions in hybrid populations based on skin reflectance data. These methods are applied to hybrid populations of known ancestry and yield results generally quite similar to those expected based on a simple genetic model. Results indicate the usefulness of these methods in hybridization studies and in the development and refinement of models of the genetics of skin color
Interobserver error in human skin colorimetry
Twenty light‐skinned adults were measured at the upper inner arm site using two commonly used reflectance spectrophotometers. Each subject was measured by each of three investigators to assess the influence of interobserver error on the reflectance readings. A repeated measures design analysis of variance showed no significant variance component due to observers
Human biology in Mexico. II. A comparison of blood group, serum and red cell enzyme frequencies, and genetic distances of the Indian populations of Mexico
Three hundred and ninety‐five individuals from two populations from the State of Tlaxcala, Mexico, were studied in relation to the ABO, Rh, MNS, P, Kell, Lewis, Diego, Kidd, Duffy, Haptoglobin, Transferrin, Group specific component, Albumin, Acid Phosphatase and Phosphoglucomutase systems. One of the populations (San Pablo del Monte) is Indian, while the other (City of Tlaxcala) is Mestizo. The alleles which show variation in the Mestizo populati…
The use of quantitative traits in the study of human population structure
Studies of human population structure and history have tended to use demographic and/or serological data for analysis. This paper reviews the methods and studies that incorporate quantitative traits (usually polygenic traits) in such analyses. Methods of assessing the degree and pattern of among-group variation are discussed, and are characterized as being model-free or model-bound. Model-free methods deal with the measure of overall populational…
The effects of aging and secular trend on adult stature in rural western Ireland
Cross‐sectional data, consisting of anthropometric measurements for 347 adult males and 261 adult females in western Ireland measured during the 1930s, were used to determine the effects of aging and secular change upon stature. Estimates of statural loss due to aging were obtained using partial regression of stature on age while controlling for subischial length, and regression of the difference between observed stature and maximum predicted sta…
Skin colorimetry in belize. I. Conversion formulae
Comparisons between skin colorimetry reports have been hampered by the common use of two different types of portable reflectometers, which sample reflectances at different wavelengths. In an attempt to provide direct comparability between the two machines, multiple linear regression equations were derived from reflectance spectrophotometry readings on 308 Black Caribs and 175 Creoles in Belize, Central America, using both machines. Cross validati…
Human biology in Mexico. II. A comparison of blood group, serum and red cell enzyme frequencies, and genetic distances of the Indian populations of Mexico
Three hundred and ninety‐five individuals from two populations from the State of Tlaxcala, Mexico, were studied in relation to the ABO, Rh, MNS, P, Kell, Lewis, Diego, Kidd, Duffy, Haptoglobin, Transferrin, Group specific component, Albumin, Acid Phosphatase and Phosphoglucomutase systems. One of the populations (San Pablo del Monte) is Indian, while the other (City of Tlaxcala) is Mestizo. The alleles which show variation in the Mestizo populati…
Population structure and anthropometric variation in rural western Ireland
The study of human population structure allows the assessment of cultural and historical influences on mating probabilities, and, hence, genetic variation. A commonly used model is isolation by distance, which predicts a negative exponential relationship between genetic similarity and geographic distance. Anthropometric data collected during the 1930's for 261 adult women in 12 towns of rural western Ireland were used to test the isolation by dis…
Skin colorimetry in Belize. II. Inter‐ and intra‐population variation
Skin colorimetry readings taken in Belize, Central America (formerly British Honduras) with the two most commonly used portable reflectometers reveal significant differences in mean reflectance between Garifuna (Black Caribs) and Creoles, and between Garifuna in two settlements. These differences are related to variation in African, Indian, and European admixture, as estimated from serological markers. Sex differences are not evident in univariat…
Admixture estimation using skin reflectance data
Several different methods are suggested for the estimation of admixture proportions in hybrid populations based on skin reflectance data. These methods are applied to hybrid populations of known ancestry and yield results generally quite similar to those expected based on a simple genetic model. Results indicate the usefulness of these methods in hybridization studies and in the development and refinement of models of the genetics of skin color
Admixture and skin color in the transplanted Tlaxcaltecan population of Saltillo, Mexico
Ethnohistoric accounts and serological analyses have documented the genetic effects of transplantation and admixture of several subpopulations of Tlaxcaltecans in Saltillo, Mexico. Interpopulational affinities are assessed using skin reflectance readings taken at the upper inner arm site with a Photovolt Model 670 reflectance spectrophotometer for these groups, focusing on the barrios of La Minita and Chamizal. Genetic distance analyses based on …
Interobserver error in human skin colorimetry
Twenty light‐skinned adults were measured at the upper inner arm site using two commonly used reflectance spectrophotometers. Each subject was measured by each of three investigators to assess the influence of interobserver error on the reflectance readings. A repeated measures design analysis of variance showed no significant variance component due to observers
Sex and Age Variation in the Skin Color of Irish Children
Human biology in Mexico. II. A comparison of blood group, serum and red cell enzyme frequencies, and genetic distances of the Indian populations of Mexico
Three hundred and ninety‐five individuals from two populations from the State of Tlaxcala, Mexico, were studied in relation to the ABO, Rh, MNS, P, Kell, Lewis, Diego, Kidd, Duffy, Haptoglobin, Transferrin, Group specific component, Albumin, Acid Phosphatase and Phosphoglucomutase systems. One of the populations (San Pablo del Monte) is Indian, while the other (City of Tlaxcala) is Mestizo. The alleles which show variation in the Mestizo populati…
Skin colorimetry in belize. I. Conversion formulae
Comparisons between skin colorimetry reports have been hampered by the common use of two different types of portable reflectometers, which sample reflectances at different wavelengths. In an attempt to provide direct comparability between the two machines, multiple linear regression equations were derived from reflectance spectrophotometry readings on 308 Black Caribs and 175 Creoles in Belize, Central America, using both machines. Cross validati…
Admixture estimation using skin reflectance data
Several different methods are suggested for the estimation of admixture proportions in hybrid populations based on skin reflectance data. These methods are applied to hybrid populations of known ancestry and yield results generally quite similar to those expected based on a simple genetic model. Results indicate the usefulness of these methods in hybridization studies and in the development and refinement of models of the genetics of skin color
Interobserver error in human skin colorimetry
Twenty light‐skinned adults were measured at the upper inner arm site using two commonly used reflectance spectrophotometers. Each subject was measured by each of three investigators to assess the influence of interobserver error on the reflectance readings. A repeated measures design analysis of variance showed no significant variance component due to observers
New conversion formulae for light‐skinned populations using Photovolt and E.E.L. Reflectometers
Recent research in Belize revealed that published conversion coefficients for use between the two most commonly used reflectance spectro‐photometers were inadequate when applied to dark‐skinned populations. New research in Ireland shows that the published conversion coefficients for light‐skinned populations are also inadequate. A total of 320 school children from Longford, Ireland were measured for skin reflectances at the upper inner arm site w…
Population structure and anthropometric variation in rural western Ireland
Models of population structure can be investigated using data on anthropometric variation among local populations. Anthropometric data collected by Dupertuis and Dawson during the 1930s were analysed from 347 males and 261 females in 12 towns in three counties of western Ireland. We hypothesized that recent migration would decrease the degree of among-group variation. To test this hypothesis, two additional samples were created by excluding known…
Estimating the number of loci determining skin colour in a hybrid population
A model developed by Stern to estimate the number of loci determining human skin colour in African-European hybrid populations is tested on recently collected reflectance data. Despite improved measurement scales and admixture estimates, and the use of statistical goodness-of-fit tests, contradictory results are obtained. It is shown that previous authors' use of visual inspection to compare expected and observed phenotype distributions introduce…
Population structure and anthropometric variation in rural western Ireland
The study of human population structure allows the assessment of cultural and historical influences on mating probabilities, and, hence, genetic variation. A commonly used model is isolation by distance, which predicts a negative exponential relationship between genetic similarity and geographic distance. Anthropometric data collected during the 1930's for 261 adult women in 12 towns of rural western Ireland were used to test the isolation by dis…
The effects of aging and secular trend on adult stature in rural western Ireland
Cross‐sectional data, consisting of anthropometric measurements for 347 adult males and 261 adult females in western Ireland measured during the 1930s, were used to determine the effects of aging and secular change upon stature. Estimates of statural loss due to aging were obtained using partial regression of stature on age while controlling for subischial length, and regression of the difference between observed stature and maximum predicted sta…
Admixture and skin color in the transplanted Tlaxcaltecan population of Saltillo, Mexico
Ethnohistoric accounts and serological analyses have documented the genetic effects of transplantation and admixture of several subpopulations of Tlaxcaltecans in Saltillo, Mexico. Interpopulational affinities are assessed using skin reflectance readings taken at the upper inner arm site with a Photovolt Model 670 reflectance spectrophotometer for these groups, focusing on the barrios of La Minita and Chamizal. Genetic distance analyses based on …
The use of quantitative traits in the study of human population structure
Studies of human population structure and history have tended to use demographic and/or serological data for analysis. This paper reviews the methods and studies that incorporate quantitative traits (usually polygenic traits) in such analyses. Methods of assessing the degree and pattern of among-group variation are discussed, and are characterized as being model-free or model-bound. Model-free methods deal with the measure of overall populational…
Skin colorimetry in Belize. II. Inter‐ and intra‐population variation
Skin colorimetry readings taken in Belize, Central America (formerly British Honduras) with the two most commonly used portable reflectometers reveal significant differences in mean reflectance between Garifuna (Black Caribs) and Creoles, and between Garifuna in two settlements. These differences are related to variation in African, Indian, and European admixture, as estimated from serological markers. Sex differences are not evident in univariat…
Genetic implications of return migration
Comparison of birthplaces of parents and offspring in Longford, Ireland, shows a high proportion of offspring with birthplaces outside of Ireland. Upon closer examination it was found that the majority of these children had parents who themselves were born in Ireland. These findings indicate a high rate of return migration, whereby an emigrant returns to his/her place of origin. These findings have three genetic implications: (1) Return migration…
Sex and Age Variation in the Skin Color of Irish Children
Demography (10 obras) · Biology (9 obras) · Mathematics (9 obras) · Population (9 obras) · Statistics (9 obras) · Reflectivity (6 obras) · Geography (5 obras) · Sociology (5 obras) · Genetic and phenotypic traits in livestock (4 obras) · Optics (4 obras)