Punnett Square Generator
Build Punnett squares for complete, incomplete, codominant, sex-linked, and ABO crosses with ratios, walkthroughs, and exportable grids.
What it does
Select an inheritance mode—complete, incomplete, codominant, multiple alleles (ABO), or sex-linked—then enter parent genotypes or load a textbook preset such as hemophilia, sickle cell, or snapdragon flower color. The Punnett grid updates as you type, showing genotype and phenotype labels in each cell, reduced ratios, and visual proportion bars.
Expand the step-by-step walkthrough to see gamete formation, grid fill, and ratio derivation without working it out by hand. Set custom phenotype names for your trait labels. Download PNG or SVG for slides and worksheets, copy the grid as a table, or share a link that restores the exact cross. Recent crosses stay in your browser history.
Why researchers use it
- Skip hand-drawn grids when checking genetics homework
- Handle incomplete dominance and codominance correctly
- Model X-linked crosses with standard notation
- Export print-ready squares for teaching materials
- Share exact crosses with students via link
Best for
- Introductory genetics problem sets
- ABO and MN blood type crosses
- X-linked recessive and dominant traits
- Incomplete dominance flower color examples
- Dihybrid Mendelian ratio exercises
- Preparing lecture slides and worksheets
What makes it different
Omni Calculator and punnettsquare.org handle simple dominant/recessive crosses but not incomplete dominance, codominance, or ABO typing in one place. Most skip step-by-step explanations and offer no PNG or SVG export. Bifido Pro covers non-Mendelian modes but requires Windows and manual trait-file setup.
This browser tool combines five inheritance modes, 28 curated textbook presets, collapsible gamete-to-ratio walkthroughs, color-coded grids with a print-friendly toggle, and one-click PNG, SVG, table, or share-link export—no install or account.
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