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    Family Height Genetics Calculator

    Advanced genetic analysis using extended family height data. Get polygenic risk scores, heritability analysis, and inheritance patterns for comprehensive height prediction.

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    5'10.0"

    Advanced Family Genetics Analysis

    Family genetics analysis provides the most comprehensive height prediction by incorporating multiple generations of genetic data. This approach can be 15-20% more accurate than simple parental height methods when sufficient family data is available.

    Genetic Contribution by Relationship

    • Parents: 50% genetic contribution each (direct inheritance)
    • Grandparents: 12.5% each (second-generation effects)
    • Siblings: ~45% shared genetics (helpful for validation)
    • Aunts/Uncles: 25% shared genetics (extended family patterns)

    Polygenic Risk Scores

    Polygenic risk scores estimate the cumulative effect of multiple height-related genes. While simplified in this calculator, real polygenic scores consider hundreds of genetic variants that collectively influence adult height.

    Heritability and Environmental Factors

    Height heritability is approximately 80%, meaning genetics account for about 80% of height variation within populations. The remaining 20% comes from:

    • Nutrition during growth periods
    • Overall health and disease history
    • Hormonal factors and puberty timing
    • Environmental stressors

    Clinical Applications

    Extended family analysis is used in clinical genetics for:

    • Identifying familial short or tall stature patterns
    • Assessing risk for growth disorders
    • Genetic counseling for family planning
    • Research into height-related genetic variants

    Limitations and Considerations

    While more accurate than simple methods, family genetics analysis still has limitations:

    • Cannot predict individual genetic recombination events
    • Assumes similar environmental conditions across generations
    • May not account for rare genetic variants
    • Requires accurate family height reporting