1. What is the Punnett Square Calculator?

The Genetic Punnett Square Calculator estimates the probability of eye color inheritance based on parental genotypes. It uses basic Mendelian genetics principles to predict offspring traits.

2. How Does the Calculator Work?

The calculator uses the probability formula:

Where:

• \( P \) — Probability of specific eye color
• \( F \) — Number of favorable genotype combinations
• \( T \) — Total possible genotype combinations (always 4 for monohybrid cross)

Explanation: The calculator determines all possible allele combinations from both parents 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 child needs only one B allele to have brown eyes, while two b alleles are needed for blue eyes.

4. Using the Calculator

Tips: Select the known or assumed genotypes for both parents. BB = homozygous brown, Bb = heterozygous, bb = homozygous blue.

5. Frequently Asked Questions (FAQ)

Q1: Is eye color really this simple?
A: While simplified, this model represents the basic inheritance pattern. Actual eye color involves multiple genes but brown/blue is primarily determined by OCA2 gene.

Q2: What if one parent has green eyes?
A: This calculator uses a two-allele (B/b) model. Green eyes involve more complex genetics not accounted for here.

Q3: Can two blue-eyed parents have a brown-eyed child?
A: Extremely rare but possible with genetic mutations or if parents are Bb but appear blue-eyed due to other genetic factors.

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

Q5: What does heterozygous mean?
A: It means having two different alleles for a gene (Bb). Homozygous means two identical alleles (BB or bb).