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Related Concept Videos

Pedigree Analysis01:35

Pedigree Analysis

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Polygenic Traits01:18

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...
X-linked Traits01:19

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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”.
Pedigree Analysis01:35

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Polygenic Traits01:18

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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...
Heritability01:06

Heritability

Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic" a trait is,...

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Skeletal Muscle Gender Dimorphism from Proteomics
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Familial resemblance for physique: heritabilities for somatotype components.

P T Katzmarzyk1, R M Malina, L Pérusse

  • 1Department of Kinesiology and Health Science, York University, North York, Ontario, Canada. katzmarz@yorku.ca

Annals of Human Biology
|October 7, 2000
PubMed
Summary
This summary is machine-generated.

Genetic factors significantly influence human physique, as evidenced by strong parent-child resemblance in Heath-Carter anthropometric somatotype components. This study highlights the role of heritability in body shape variation.

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Area of Science:

  • Anthropology
  • Human Genetics
  • Biometrics

Background:

  • Human physique exhibits complex variations.
  • Understanding the inheritance patterns of anthropometric traits is crucial for population studies.

Purpose of the Study:

  • To investigate familial resemblance in Heath-Carter anthropometric somatotype.
  • To estimate the heritability of somatotype components and their familial correlations.

Main Methods:

  • Utilized principal components analysis on endomorphy, mesomorphy, and ectomorphy.
  • Applied regression procedures to adjust for age, sex, and inter-component effects.
  • Fit a familial correlation model to assess resemblance across generations.

Main Results:

  • Found significant heritability estimates for all somatotype components (56-68%).
  • Observed no significant spouse resemblance, indicating traits are not strongly selected in partners.
  • Demonstrated significant parent-child correlations, suggesting genetic influence on physique.

Conclusions:

  • Familial resemblance in anthropometric somatotype is largely attributable to genetic factors.
  • The findings support the role of genes in shaping human physique, assuming random mating.
  • Significant parent-child correlations underscore the heritable nature of body composition.