How to Solve Punnett Squares - Free Printable

Let’s walk through this step by step.

We’re looking at a Punnett square — it’s used to predict what traits offspring might get from their parents in genetics.

On the left side, we have two letters: R and r (these are alleles — different versions of a gene).
On the top, we also have R and r.

The goal is to fill in each box by combining the letter from the left with the letter from the top.

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Step 1: Top-left box
Left = R, Top = R → Combine them → RR

Step 2: Top-right box
Left = R, Top = r → Combine them → Rr

Step 3: Bottom-left box
Left = r, Top = R → Combine them → Rr

Step 4: Bottom-right box
Left = r, Top = r → Combine them → rr

So the filled-in square should look like:

- Top row: RR, Rr
- Bottom row: Rr, rr

That matches exactly what’s shown on the right side of the image.

This means the completed Punnett square correctly shows all possible combinations of the parent alleles.

Final Answer:
The Punnett square is correctly filled as:
Top row: RR, Rr
Bottom row: Rr, rr