📊 Chapter 97 · Multifactorial & Polygenic Inheritance

Nelson Textbook of Pediatrics 22nd Edition | Threshold model, recurrence risks, gene-environment interactions, common pediatric complex traits: neural tube defects, cleft lip/palate, congenital heart defects, pyloric stenosis, asthma, type 1 diabetes, and empirical recurrence counseling.

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📋 30 Clinical Scenarios — Multifactorial & Polygenic Inheritance (FCPS level)

📇 High‑Yield Review Cards (Multifactorial Traits)

🧬 Multifactorial Disorders: Threshold Model & Clinical Scenarios

Click any disorder to understand the multifactorial threshold model, genetic liability, and recurrence patterns.
⭐ Threshold model: Liability (genetic + environmental) follows normal distribution. Disease occurs when liability exceeds threshold. Recurrence risk increases with more affected relatives and greater severity.

📋 Stepwise Approach: Multifactorial Recurrence Risk Counseling

    ⚡ Reflex Prompts — Multifactorial Risk Assessment

    📖 Summary: Multifactorial & Polygenic Inheritance — Nelson 22nd Ed, Ch 97