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Polygenic Traits

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...

Polygenic Traits

Polygenic Traits

X-linked Traits

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

X-linked Traits

X-linked Traits

Genetic Lingo

Genetic Lingo

Pleiotropy

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

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Related Experiment Video

Updated: Apr 5, 2026

Quantification of Orofacial Phenotypes in Xenopus

Quantification of Orofacial Phenotypes in Xenopus

Published on: November 6, 2014

Morphoscopic Trait Expression in "Hispanic" Populations.

Joseph T Hefner¹, Marin A Pilloud², Cullen J Black³

¹Department of Anthropology, Michigan State University, East Lansing, MI.

Journal of Forensic Sciences

|August 15, 2015

Summary

This summary is machine-generated.

Support Vector Machine (SVM) models accurately estimate ancestry using cranial traits. Differentiating between Hispanic and Guatemalan groups highlights population-specific variations for forensic anthropology.

Keywords:

Hispanics Support Vector Machines ancestry forensic anthropology forensic science morphoscopic traits

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Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

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Published on: November 4, 2025

Area of Science:

Forensic Anthropology
Population Genetics
Biometrics

Background:

Cranial morphoscopic traits are used in forensic anthropology for ancestry estimation.
Understanding population variation is crucial for accurate classification.
The term "Hispanic" encompasses diverse genetic backgrounds.

Purpose of the Study:

To evaluate population variation of eight cranial morphoscopic traits.
To assess the effectiveness of the Support Vector Machine (SVM) method for ancestry estimation.
To investigate differences between Southwest Hispanic and Guatemalan populations.

Main Methods:

Utilized samples of Southwest Hispanics, Guatemalans, American Blacks, and American Whites.
Applied the Support Vector Machine (SVM) method for classification model development.
Employed univariate statistical tests to identify trait differences between Hispanic groups.

Main Results:

SVM effectively differentiated between the four groups, with classification rates from 72% to 94%.
Pooling Guatemalan and Southwest Hispanic samples improved classification accuracy for all groups.
Significant differences in six of eight cranial traits were found between the two Hispanic groups.

Conclusions:

SVM is a viable tool for ancestry estimation in forensic anthropology.
Cranial morphoscopic data can be broadened for ancestry assessment.
Population-specific analyses are essential due to unique histories within diverse groups.