Answer
🌱 Polygenic Traits: A Non-Mendelian Inheritance Pattern
🔬 What Are Polygenic Traits?
Polygenic traits are characteristics controlled by multiple genes, each contributing a small additive effect. These traits differ from Mendelian traits in that they exhibit continuous variation instead of discrete categories.
⚖️ Key Characteristics
- Multiple Genes Involved: More than one gene contributes to a single trait.
- Additive Effect: Each gene adds a small effect, collectively shaping the phenotype.
- Continuous Variation: Traits fall along a gradient or spectrum (e.g., height).
- Non-Mendelian Inheritance: No clear dominant/recessive ratios; follows a complex pattern.
🌍 Examples of Polygenic Traits
- Skin color
- Height
- Weight
- Eye color
📊 Comparison Table
| Feature | Polygenic Traits | Mendelian Traits |
|---|---|---|
| Number of Genes Involved | Multiple genes | One gene |
| Phenotypic Variation | Continuous (spectrum) | Discrete (clear categories) |
| Inheritance Pattern | Non-Mendelian | Mendelian (3:1, 9:3:3:1) |
| Examples | Height, skin color | Pea plant height, seed shape |