Incomplete Dominance Calculator

In incomplete dominance, neither parent's trait fully overrides the other — instead, offspring can show a blended, intermediate phenotype (like pink flowers from red and white parents). Enter your trait name, dominant, intermediate, and recessive phenotypes, then select your Parent 1 and Parent 2 genotypes to see the dominant, intermediate, and recessive phenotype probabilities, plus the genotype ratio for all possible offspring.

Results

Dominant Phenotype Probability

--

Intermediate Phenotype Probability

--

Recessive Phenotype Probability

--

Genotype Ratio

--

Results Table

More Biology Tools

Frequently Asked Questions

What is incomplete dominance?

Incomplete dominance is a genetic inheritance pattern where neither allele is completely dominant over the other, resulting in a blended or intermediate phenotype in heterozygous individuals.

Is incomplete dominance the same as co-dominance?

No, they are different. In incomplete dominance, the traits blend together (like red + white = pink), while in co-dominance, both traits are expressed simultaneously without blending (like AB blood type).

Can I use this calculator for human traits?

While this calculator demonstrates genetic principles, most human traits are complex and influenced by multiple genes. Simple incomplete dominance is rare in humans, but examples include some blood proteins and certain hair textures.

What's the difference between genotype and phenotype?

Genotype refers to the genetic makeup (the alleles present, like RR or Rr), while phenotype refers to the observable characteristics (like red or pink flowers) that result from the genotype.

Are Punnett square predictions 100% accurate?

Punnett squares show theoretical probabilities based on simple inheritance patterns. Real-world results may vary due to environmental factors, gene interactions, and statistical variation in small sample sizes.

Why do some traits skip generations?

This typically occurs with recessive traits in complete dominance, not incomplete dominance. In incomplete dominance, heterozygous individuals show an intermediate phenotype, so traits don't truly 'skip' generations.

How does this calculator work?

The calculator creates a Punnett square by combining all possible gametes from each parent, then determines the probability of each genotype and corresponding phenotype based on incomplete dominance inheritance patterns.