🧬 Dihybrid Cross Punnett Square (4×4)
Trait 1 uses A/a and Trait 2 uses B/b. Capital letter = dominant; lowercase = recessive.
👩🧬 Mother’s traits
👨🧬 Father’s traits
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📊 Key outcomes
Phenotypic ratio (A_B_ : A_bb : aaB_ : aabb)—
Genotypic ratio (9 classes)—
Classic AaBb × AaBb→ 9:3:3:1
🧩 Punnett Square (4×4)
♂︎\♀︎
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Headers show parental gametes (AB, Ab, aB, ab); inner cells show offspring genotypes (e.g., AaBb).
🧾 Resulting probabilities (%)
| AABB | AABb | AAbb | AaBB | AaBb | Aabb | aaBB | aaBb | aabb |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | — | — | — | — |
Genotypic ratio (AABB:AABb:AAbb:AaBB:AaBb:Aabb:aaBB:aaBb:aabb): —
Phenotypic ratio (A_B_ : A_bb : aaB_ : aabb): —
🔠 Allele legend
| Symbol | Meaning |
|---|---|
| A | Dominant allele of Trait 1 |
| a | Recessive allele of Trait 1 |
| B | Dominant allele of Trait 2 |
| b | Recessive allele of Trait 2 |
🧮 Step-by-step derivation (click to expand)
📚 References
- Standard Mendelian inheritance (complete dominance; Law of Independent Assortment).