Incomplete Dominance Punnett Square Calculator

Incomplete dominance occurs when neither allele completely masks the other, resulting in an intermediate phenotype—a fascinating twist on classic Mendelian genetics. Our Incomplete Dominance Punnett Square Calculator makes it easy to visualize and predict offspring traits for traits that blend together, such as pink flowers from red and white parents. Discover additional free inheritance calculators and learning tools on our main site.

Select the genotypes of Parent 1 and Parent 2 (e.g., RR for homozygous dominant, Rr for heterozygous, rr for homozygous recessive). Click Calculate to generate a 2×2 Punnett square that shows all possible offspring genotypes and their corresponding phenotypes.

This interactive tool demonstrates how incomplete dominance blends traits, showing intermediate phenotypes (e.g., pink flowers) instead of fully dominant or recessive outcomes.

• Genotypes: RR, Rr, and rr combinations displayed clearly.
• Phenotypes: Intermediate traits (e.g., pink) alongside the pure parental traits (e.g., red or white).
• Ratios: A precise breakdown of genotype and phenotype probabilities.

Incomplete dominance is essential for understanding why some traits don’t follow simple dominant-recessive rules. This calculator is perfect for:

• Students: Reinforcing genetics concepts with hands-on, interactive practice.
• Teachers: Demonstrating complex inheritance patterns visually.
• Families: Understanding traits like flower color blending in plants or coat colors in animals.

• Genotypic ratio:
  • 25% RR
  • 50% Rr
  • 25% rr
• Phenotypic ratio:
  • 25% red (RR)
  • 50% pink (Rr)
  • 25% white (rr)

Our calculator displays this visually in a Punnett square, making it easy to grasp how incomplete dominance works.

1. Select the genotypes of both parents from the dropdown menus.
2. Click Calculate to generate the Punnett square.
3. View results: genotype percentages and phenotype outcomes.
4. Download or copy results for reports or classwork.

1. Incomplete Dominance vs. Co-Dominance
   Incomplete dominance shows an intermediate trait (e.g., pink flowers), while co-dominance expresses both alleles equally (e.g., roan cattle).
2. Intermediate Phenotypes
   Neither allele is completely dominant, so traits blend together visually.
3. Mendel’s Laws Adapted
   Mendel’s laws provide a foundation, but incomplete dominance adds nuance to inheritance patterns.

Is incomplete dominance the same as co-dominance?

No. Incomplete dominance produces blended traits, while co-dominance shows both alleles equally.

Can I use this calculator for human traits?

It’s more commonly applied to plants and animals, but certain human traits (like some hair textures) can show incomplete dominance.

Does this calculator show heterozygous outcomes?

Yes! The Rr genotype is key to displaying the intermediate phenotype.

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Our Incomplete Dominance Punnett Square Calculator simplifies complex genetics concepts. Whether you’re studying biology, teaching genetics, or just curious about how traits blend, this tool is your perfect companion.