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Sibling correlations for cranial measurements from serial radiographs
Journal of Craniofacial Genetics and Developmental Biology
|January 1, 1984
Summary
Sibling resemblance for craniofacial measurements increases with age, suggesting both genetic and environmental influences. Most correlations exceed 0.5, indicating significant heritability and shared sibling environment impacts facial development.
Area of Science:
- Human Genetics
- Craniofacial Biology
- Developmental Biology
Background:
- Craniofacial measurements are critical for understanding human growth and development.
- Sibling resemblance in physical traits can provide insights into genetic and environmental contributions.
Purpose of the Study:
- To analyze sibling correlations for nine craniofacial measurements using serial data from the Fels Longitudinal Study of Growth.
- To investigate the patterns of craniofacial trait resemblance between siblings over time.
Main Methods:
- Utilized lateral cephalometric radiographs from siblings in the Fels Longitudinal Study.
- Analyzed serial measurements to compare sibling correlations at one-year intervals.
- Calculated sibling correlations for nine distinct craniofacial dimensions.
Main Results:
- Sibling correlations for craniofacial measurements generally increase from infancy to adulthood.
- Many correlations were significantly greater than zero and exceeded 0.5, a value indicative of high heritability.
- No clear pattern was observed during the intervening years between infancy and adulthood.
Conclusions:
- Genetic factors play a substantial role in craniofacial dimension resemblance among siblings.
- Shared sibling environmental factors also contribute significantly to similarities in craniofacial development.
- The findings highlight the complex interplay of nature and nurture in shaping facial morphology.