Tools

Punnett squares

Punnett square calculator Monohybrid to pentahybrid crosses with genotype and phenotype ratios, gametes, analysis and picture themes. Monohybrid cross calculator One gene, two alleles: the 2×2 square with 3:1 and 1:2:1 ratios, incomplete dominance and codominance. Dihybrid cross calculator Two genes in a 4×4 square with the 9:3:3:1 phenotype ratio and the full genotype ratio. Test cross calculator Cross an unknown against a homozygous recessive tester and read whether it was AA or Aa from the 1:1 ratio. Pea plant Punnett square Mendel's seed colour and shape drawn as peas, with the classic 9:3:3:1 dihybrid ratio. Genotype & phenotype ratio calculator Type any cross from one to five genes and get the simplified genotypic and phenotypic ratios side by side.

Trait predictors

Eye color calculator Predict a baby's eye color odds from both parents' alleles: brown, hazel, green, amber, gray or blue. Blood type calculator ABO and Rh inheritance in one square: every blood type a child can have, and how likely each is. Hair color calculator Predict a baby's hair color odds from both parents' alleles: black, brown, red or blonde. Baby height predictor Estimate a child's adult height from both parents' heights with the mid-parental formula, in cm or feet and inches.

Inheritance

Pedigree chart maker Draw a family pedigree with standard symbols, find which inheritance pattern fits, infer genotypes and calculate risk for the next child. X-linked inheritance Sex-linked crosses for traits like color blindness and hemophilia, with sons and daughters shown separately.

Population

Hardy-Weinberg calculator Allele frequencies to genotype frequencies (p², 2pq, q²) for 2 to 5 alleles, or carrier rates from a recessive phenotype frequency. Population growth calculator Exponential and logistic growth curves from starting size, growth rate, time and carrying capacity.

Statistics

Chi-square test Check whether your observed offspring counts fit the expected Mendelian ratio: χ², degrees of freedom and p-value.

Evolution

Phylogenetic tree maker Paste a Newick string or a species list and get a clean evolutionary tree, cladogram or with branch lengths, as PNG or SVG. Cladogram maker Type species names or nested groups and get a clean cladogram of who shares a common ancestor, as PNG or SVG. Mutation simulator Evolve a DNA sequence over time under a substitution model and watch mutations accumulate along the lineage.