1. What is a Punnett Square?

A Punnett square is a diagram that is used to predict the genotype and phenotype probabilities of offspring from parental alleles. For eye color, it helps predict the probability of a child having brown or blue eyes based on parental genotypes.

2. How Does the Calculator Work?

The calculator uses the probability formula:

Where:

• \( P \) — Probability (dimensionless)
• \( F \) — Favorable outcomes (dimensionless)
• \( T \) — Total possible outcomes (dimensionless)

Explanation: The calculator combines alleles from each parent to determine all possible genetic combinations and calculates the probability of each eye color outcome.

3. Understanding Eye Color Genetics

Details: Brown eye color (B) is dominant over blue (b). A person with BB or Bb genotype will have brown eyes, while only bb results in blue eyes.

4. Using the Calculator

Tips: Select the genotype for each parent. BB = homozygous brown, Bb = heterozygous, bb = homozygous blue. The calculator will show the probability of each eye color in their potential offspring.

5. Frequently Asked Questions (FAQ)

Q1: Is eye color really this simple genetically?
A: While the B/b model explains basic inheritance, eye color is actually polygenic with multiple genes contributing to the final color.

Q2: Can two blue-eyed parents have a brown-eyed child?
A: In this simple model, no (bb × bb always produces bb). In reality, very rarely possible due to genetic mutations or more complex inheritance patterns.

Q3: What about green or hazel eyes?
A: This simplified calculator only models brown vs. blue. More complex models account for other colors through additional genes.

Q4: How accurate are these predictions?
A: This gives theoretical probabilities based on Mendelian genetics. Actual outcomes may vary due to other genetic factors.

Q5: Can this predict eye color for sure?
A: No, it only gives probabilities. Each child has independent probability based on these calculations.