How do I make a Punnett square?

Enter the two parent genotypes (for example Aa x Aa), say what the alleles control, and choose monohybrid or dihybrid. Figviz fills the grid and labels the genotype and phenotype ratios. You can refine the prompt to change the trait or cross type.

What is the difference between a monohybrid and a dihybrid cross?

A monohybrid cross follows one gene and uses a 2x2 grid, giving the classic 3:1 phenotype ratio for Aa x Aa. A dihybrid cross follows two genes at once and uses a 4x4 grid, giving the classic 9:3:3:1 ratio. Figviz makes both.

Can it do dihybrid (4x4) and sex-linked crosses?

Yes. Ask for a dihybrid cross and Figviz draws the full 4x4 grid with the gametes labeled, and you can request X-linked, codominance, multiple-allele (blood type), or incomplete-dominance crosses too.

Is the Punnett square maker free?

Yes. You can generate Punnett squares on the free credits every account starts with. Buying any pay-as-you-go credit pack removes the watermark and unlocks higher resolutions. Credits never expire.

Can I use it for homework, class, or worksheets?

Yes. Download a high-resolution PNG (up to 4K) for slides, printed worksheets, and study guides. As an AI tool it is great for practice and teaching; double-check the ratios before high-stakes use, and diagrams from a paid account can be used in your own teaching materials.

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Punnett Square Maker Punnett Squares

Describe a genetic cross and get a clean, labeled Punnett square in seconds, with the allele combinations filled in and the genotype and phenotype ratios worked out. Monohybrid, dihybrid, sex-linked, and more.

Last updated: 2026-06-21

✓Monohybrid & dihybrid✓Genotype & phenotype ratios✓Labeled alleles✓Slide & print ready

Punnett Square Maker

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Punnett Square Examples

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Monohybrid Cross (Aa x Aa)

A 2x2 monohybrid cross with the classic 3:1 dominant-to-recessive ratio labeled.

geneticsmonohybridlabeled

Dihybrid Cross (AaBb x AaBb)

A 4x4 dihybrid cross with the classic 9:3:3:1 phenotype ratio.

geneticsdihybrid4x4

Blood Type Cross (ABO)

Multiple-allele ABO blood type cross showing possible offspring blood types.

geneticsblood typecodominance

Sex-Linked (X-linked) Cross

An X-linked trait cross (e.g. colorblindness) showing carrier and affected offspring.

geneticssex-linkedX-linked

Incomplete Dominance Cross

Incomplete dominance (red x white = pink) with the 1:2:1 phenotype ratio.

geneticsincomplete dominanceflowers

Test Cross

A test cross (Aa x aa) used to determine an unknown genotype.

geneticstest crossmonohybrid

What is a Punnett square?

A Punnett square is a grid that predicts the possible genotypes of offspring from a genetic cross. The alleles each parent can pass on are written along the top and side, and each cell shows one possible combination, which lets you read off the genotype and phenotype ratios. Figviz builds the grid and fills in the combinations from a plain description of the cross, so you do not have to draw and label cells by hand.

How to make a Punnett square

Write each parent genotype (for example Aa x Aa).

Say what the alleles mean (A = brown eyes dominant, a = blue eyes recessive).

Choose monohybrid (one gene) or dihybrid (two genes).

Pick a style and size, then generate.

Read the filled grid and the genotype and phenotype ratios, and refine the prompt if needed.

Types of crosses you can make

Monohybrid cross: one gene, a 2x2 grid (classic 3:1 phenotype ratio).

Dihybrid cross: two genes, a 4x4 grid (classic 9:3:3:1 ratio).

Sex-linked (X-linked) cross: traits carried on the X chromosome.

Codominance and multiple alleles: ABO blood types.

Incomplete dominance: blended phenotypes like pink flowers.

Test cross: reveal an unknown genotype against a recessive parent.

Tips for an accurate Punnett square

State the genotypes clearly and use a capital letter for the dominant allele and the matching lowercase for the recessive. For dihybrid crosses, list the gametes (AB, Ab, aB, ab) so the 4x4 grid fills correctly. Always sanity-check the ratios against what you expect (3:1 for a monohybrid Aa x Aa, 9:3:3:1 for a dihybrid) and regenerate if a cell looks off.

Frequently asked questions

A Punnett square maker is a tool that builds a genetics cross grid for you. With Figviz you describe the parent genotypes and the trait, and the AI draws the labeled square with each allele combination filled in and the ratios worked out, in seconds.

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