Co-Dominance Punnett Square Calculator

In genetics, co-dominance occurs when both alleles contribute equally and visibly to the phenotype, producing a unique outcome. Our Co-Dominance Punnett Square Calculator lets you explore this fascinating inheritance pattern and predict offspring traits quickly and easily. Discover more inheritance calculators and resources on our main website.

Select the genotypes of Parent 1 and Parent 2 from the dropdown menus (e.g., IAIA, IAIB, IBIB). Click Calculate to generate a 2×2 Punnett square that shows all possible offspring genotypes and their predicted phenotypes.
Unlike simple dominant-recessive patterns, co-dominance results in a blend where both alleles are fully expressed—like AB blood type or roan cattle.

• Genotypes: Visual representation of all possible allele combinations.
• Phenotypes: Clear illustration of co-dominant expressions, like AB blood group in humans or red-and-white spotted cattle.
• Ratios: Precise percentages showing the probability of each genotype and phenotype occurring in the offspring.

Co-dominance is an essential concept in genetics, providing insight into how some traits break traditional Mendelian patterns. This calculator is perfect for:

• Students: Visualize and understand co-dominant inheritance with real-world examples.
• Teachers: Demonstrate complex inheritance patterns in an interactive way.
• Families: Learn how certain traits—like AB blood group—might appear in your children.

• Genotypic ratio:
  • 25% IAIA
  • 50% IAIB
  • 25% IBIB
• Phenotypic ratio:
  • 25% Type A
  • 50% Type AB (co-dominant)
  • 25% Type B

Our calculator displays these results visually in a Punnett square, making co-dominance easy to understand.

• Select the parental genotypes from the dropdown menus.
• Click Calculate to generate the Punnett square.
• View genotype and phenotype outcomes instantly.
• Download or copy results for your studies or reports.

1. Co-Dominance vs. Complete Dominance
   In co-dominance, both alleles are equally expressed, unlike complete dominance where one allele masks the other.
2. Examples of Co-Dominance

• AB Blood Type: Both A and B antigens are expressed.
• Roan Cattle: Red and white hairs intermingle.

3. Mendel’s Laws Adapted
   Though Mendel’s laws laid the groundwork, co-dominance shows that inheritance patterns can be more complex than dominant/recessive.

Is co-dominance the same as incomplete dominance?

No. In incomplete dominance, the alleles blend (e.g., red × white flowers make pink). In co-dominance, both alleles are fully expressed (e.g., AB blood type).

Can I use this calculator for human traits?

Absolutely! It’s especially useful for predicting AB blood type inheritance.

Does this calculator account for multiple alleles?

Yes, it supports traits like human blood type that involve multiple alleles and co-dominant expression.

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Our Co-Dominance Punnett Square Calculator brings complex inheritance patterns to life. Whether you’re a student, teacher, or curious about your own genetics, this tool is your go-to resource for understanding co-dominance.