Life, under
the lens.

Cross two parents in a Punnett square, translate a DNA sequence into protein, model exponential and logistic population growth, test a population for Hardy-Weinberg equilibrium, and explore nine more calculators from enzyme kinetics to energy pyramids. Each tool pairs the result with a live diagram and worked steps that update as you change the inputs.

Yes. The calculators, the cell atlas, the concept lessons, practice rounds, worksheets, and printable diagrams are all free, with no account and no sign-up. Every calculation runs in your browser, so nothing you type is sent to a server.

Start with the Punnett square calculator. It handles monohybrid crosses such as Aa × Aa (3 : 1), dihybrid crosses such as AaBb × AaBb (9 : 3 : 3 : 1), up to three genes, and ABO blood types with an optional Rh factor. To check whether real offspring counts fit the predicted ratio, follow up with the chi-square test.

Yes. Every calculator shows the formula with your numbers substituted and two to four worked steps, and the sixteen concept lessons explain the idea behind each tool with a numeric example and a common misconception. Change an input and watch the steps and the diagram change with it.

Yes. Try an eight-question practice round with instant explanations across cells, genetics, molecular biology, ecology, and physiology, build a worksheet of 8, 12, or 20 questions with an optional answer key, or print a cell diagram to label and a blank Punnett grid to fill in.