Question 1

What is a Punnett Square?

Accepted Answer

A Punnett square is a visual diagram to predict offspring genotype combinations from known parental genotypes. Created by Reginald Punnett around 1905.

Question 2

How does the Punnett Square work?

Accepted Answer

Write one parent's gametes across the top, the other's down the side Then: Fill each cell by combining corresponding alleles Then: Count genotype frequencies from the completed grid.

Question 3

Can you give an example of how to use the Punnett Square?

Accepted Answer

Example: Input Aa × Aa gives a result of AA, Aa, Aa, aa → 1:2:1 genotype · 3:1 phenotype (4 cells; AA=1, Aa=2, aa=1).

Question 4

Is the Punnett Square free to use?

Accepted Answer

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

Question 5

How accurate is the Punnett Square?

Accepted Answer

Our Punnett Square uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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