Category · 7 tools
Free biology tools for genetics and sequences
Biology teaching tools work best when they make an assumption visible. A Punnett square is only meaningful for the inheritance model you choose, GC content depends on how ambiguous bases are treated, and magnification depends on which lenses are in the light path. These tools show the result and the assumption beside it.
The Punnett square calculator renders a single-gene cross and reports genotype and phenotype ratios; the GC content tool cleans common sequence formatting and reports base counts; the microscope calculator multiplies objective and eyepiece magnification and converts field-of-view sizes. They are educational calculators, not diagnostic or clinical tools, and not a substitute for a wet-lab protocol.
In this category
- Chi-Square Genetics Calculator
- Codon Translator
- DNA Reverse Complement Calculator
- GC Content Calculator
- Microscope Magnification Calculator
- Punnett Square Calculator
- Shannon Diversity Index Calculator
Genetics, sequences and microscopy
Educational genetics and sequence arithmetic
Biology teaching tools are models. A Punnett square shows the expected outcomes of a defined cross — usually one gene, two alleles and complete dominance — and the ratio is a probability statement, not a guarantee for any family. The GC content calculator reports what it does with ambiguous bases so the denominator is never hidden, and the microscope calculator states which lenses it assumes.
Sequence and genetics tools in this category are for learning, coursework and quick data checks. They do not validate FASTA files for publication, call variants, assess pathogenicity or replace a laboratory protocol. If a result will be used in a report, keep the input and the assumptions alongside it so a reader can reproduce the number.
- Explaining a 3:1 ratio in class
- Run Aa × Aa and show both the genotype and phenotype tables so students see where the ratio comes from.
- Checking a sequence's GC content
- Paste the sequence or a FASTA record; the tool strips headers and reports base counts before the percentage.
- Calculating total magnification
- Multiply objective and eyepiece power, then convert the field-of-view diameter for the next objective.
Guides for Biology Tools
All guidesThe format background, trade-offs and failure modes behind these tools — written for people who want to know why a conversion works the way it does.