Punnett Square Eye Color Calculator

Discover how eye color is inherited with this calculator. By selecting specific alleles for each parent, you can see the potential eye colors for their offspring, based on the dominant and recessive alleles they pass on.

Eye Color Genetics Explained

The color of your eyes is determined by the combination of alleles you inherit from your parents. Eye color is controlled by multiple genes, but in this calculator, we focus on the dominant and recessive alleles responsible for brown, green, and blue eyes.

Dominant and Recessive Eye Color Alleles

There are three main alleles that determine eye color:

• B - Dominant allele for brown eyes
• G - Dominant allele for green eyes
• b - Recessive allele for blue eyes

Brown eyes are the most dominant, meaning if one parent passes down a brown allele, the offspring will likely have brown eyes. Green is dominant over blue, but recessive to brown. Blue is recessive and only shows up when two blue alleles are passed down from both parents.

How Eye Color Inheritance Works

• Brown Eyes (B): If one parent passes a B allele, the child will likely have brown eyes, even if the other parent passes down a green or blue allele.
• Green Eyes (G): Green is dominant over blue but recessive to brown. A child will have green eyes if they inherit a G allele and a b allele.
• Blue Eyes (b): A child will have blue eyes if both parents pass down the recessive b allele.

What the Punnett Square Shows

When you select two alleles for each parent, the calculator generates all possible allele combinations for the offspring. For example, if both parents have a dominant B allele and a recessive b allele, the combinations could be:

• BB - Brown eyes
• Bb - Brown eyes (the B allele dominates)
• bb - Blue eyes (since both alleles are recessive)

In this case, the probability of the offspring having brown eyes is higher, around 75%, with a 25% chance of having blue eyes.

Phenotype and Genotype for Eye Color

By calculating both the phenotype and genotype, you can see how likely your offspring are to have a particular eye color:

• Phenotype: The observable traits, like brown, green, or blue eyes.
• Genotype: The genetic combination (e.g., BB, Bb, bb).

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