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Punnett Square Calculator Baby Eye Color

Reviewed by Calculator Editorial Team

Predict the possible eye colors of your baby using this Punnett square calculator. Understand the genetics behind eye color inheritance and calculate the probability of different outcomes.

How to Use This Calculator

Using our Punnett square calculator for baby eye color is simple:

  1. Select the eye color alleles for both parents (e.g., B for brown, b for blue)
  2. Click "Calculate" to generate the Punnett square
  3. View the possible baby eye color outcomes and their probabilities
  4. Review the detailed explanation of the genetic inheritance

The calculator uses standard Mendelian genetics principles to predict eye color inheritance patterns.

How Punnett Squares Work for Eye Color

Eye color is primarily determined by a single gene with two possible alleles:

  • B (dominant) - Brown eyes
  • b (recessive) - Blue eyes

A child inherits one allele from each parent. The possible combinations are:

BB = Brown eyes
Bb = Brown eyes
bB = Brown eyes
bb = Blue eyes

Note that the recessive blue eye allele (b) is only expressed when both parents contribute the recessive allele.

Example Calculation

Consider two parents:

  • Parent 1: Bb (Brown eyes)
  • Parent 2: Bb (Brown eyes)

The possible offspring combinations are:

BB | Bb --- | --- Bb | BB, Bb, Bb, bb

This results in a 75% chance of brown eyes and 25% chance of blue eyes.

Frequently Asked Questions

Q: Can eye color be predicted with 100% accuracy?
A: While Punnett squares provide probabilities, actual eye color can be influenced by environmental factors and other genetic factors not included in this simple model.
Q: What if one parent has green eyes?
A: This calculator focuses on the most common brown/blue eye color inheritance pattern. Green eyes are typically caused by a different genetic mechanism involving multiple genes.
Q: How accurate are the probability calculations?
A: The probabilities are based on standard Mendelian genetics. In reality, other factors like environmental influences and gene interactions may slightly alter the actual outcomes.