Printable cell diagrams and genetics worksheets
Pick a sheet, choose the blank version or the answer key, and print at true scale on A4 or US Letter. Every diagram is drawn fresh in your browser, so there is nothing to download first and nothing to sign up for.
One sheet. One lesson.
Print at 100% scale (no “fit to page”), portrait, with browser headers and footers turned off. Pick the same paper size in the print dialog. The 20 mm line at the foot of every sheet lets you check the printed scale with a ruler.
How to use these printables
- Choose a sheet and a paper size. Leave “Show answer key / labels” unticked for the student version. Tick it to generate the matching key: structure names and functions for the cell diagrams, filled and shaded Punnett squares, or a fully worked pedigree.
- Download or print. Download SVG saves a vector file that stays sharp at any size and opens in every browser, in Google Docs and Word, and in Inkscape or Illustrator. Print / save as PDF sends the sheet straight to your printer or to a PDF.
- Check the scale. Print at 100%, portrait, with headers and footers off. The 20 mm reference line at the bottom of every sheet should measure exactly 20 mm with a ruler before you run off a class set.
What each printable includes
- Animal cell to label
A generalized animal cell drawn with twelve numbered leader lines: cell membrane, cytoplasm, nucleus, nucleolus, nuclear envelope, mitochondrion, rough and smooth endoplasmic reticulum, Golgi apparatus, free ribosomes, a lysosome, and a pair of centrioles. The blank sheet ends in a twelve-row answer table; the key prints each name beside its number and adds a one-line job description for every structure.
Open this sheet - Plant cell to label
The same twelve-structure format for a plant cell: cell wall, cell membrane, cytoplasm, nucleus, nucleolus, nuclear envelope, rough ER, mitochondrion, chloroplasts with stacked grana, a large central vacuole, ribosomes, and the Golgi apparatus. Print it back to back with the animal cell for a compare-and-contrast lesson: only the plant sheet has a wall, chloroplasts, and a central vacuole, and only the animal sheet has centrioles and a lysosome.
Open this sheet - Monohybrid Punnett square grid (2 × 2)
Two 2 × 2 grids on one page, each with labeled parent-gamete boxes, a cross line, and answer lines for the genotype ratio, the phenotype ratio, and the chance of a recessive offspring. The key works Aa × Aa (1 AA : 2 Aa : 1 aa, a 3 : 1 phenotype ratio) and the Aa × aa test cross (1 : 1), shading the recessive boxes so the ratio is visible at a glance.
Open this sheet - Dihybrid Punnett square grid (4 × 4)
One 4 × 4 grid with four gamete boxes per parent, a phenotype tally table for the four classes (A_B_, A_bb, aaB_, aabb), and a product-rule check. The key fills all sixteen boxes for AaBb × AaBb, color-codes the classes, and shows the 9 : 3 : 3 : 1 ratio arriving two ways: by counting boxes and by multiplying 3/4 × 3/4, 3/4 × 1/4, 1/4 × 3/4, and 1/4 × 1/4.
Open this sheet - Blank pedigree chart (3 generations)
Three generations and twelve individuals drawn with standard symbols (squares for males, circles for females), roman-numeral generation labels, a legend, a printed scenario, and three analysis prompts. The key shades an autosomal recessive trait, writes a genotype under every symbol, and shows how an affected daughter with an unaffected father rules out X-linked recessive inheritance.
Open this sheet
Ideas for the classroom and for revision
The cell sheets pair naturally with the cell atlas: students look up each numbered structure in the atlas (most have their own page; the nucleolus and nuclear envelope are covered on the nucleus page, and the centrioles, cell wall, and central vacuole are labeled on the atlas’s reference cells), write its name in the table, then add one function in their own words. The answer key gives a one-line job for every structure, cytoplasm included. Because the plant and animal sheets share the same numbering style, they also make a quick compare-and-contrast task: which structures appear on only one of the two sheets (three on each), and what does each one let the cell do?
For genetics, have students fill the Punnett grids by hand first and only then check their ratios with the Punnett square calculator. The dihybrid sheet’s product-rule section is the bridge to harder problems: once a student sees that 3/4 × 3/4 = 9/16 reproduces the count of boxes, they can solve trihybrid questions without ever drawing a 64-box grid. The pedigree sheet prints the same scenario its key answers, so it works on its own; it also doubles as a blank canvas: describe a different inheritance scenario aloud, let students shade the symbols, and mark their reasoning against the worked autosomal recessive key.
Printable diagram questions
Wondering about the why? Start here.
What printable diagrams are available?
Five printables: an animal cell to label, a plant cell to label, a blank monohybrid Punnett square (2 × 2), a blank dihybrid Punnett square (4 × 4), and a blank three-generation pedigree chart. Each is drawn as an SVG sized for an A4 or US Letter portrait page, and a single toggle switches between the blank version for students and the labeled answer key. Between them, the two cell diagrams label all eight organelles from the cell atlas.
Read about each organelle firstHow do I print a diagram or save it as a PDF?
Press the Print / save as PDF button and your browser opens its print dialog; choose a printer, or pick “Save as PDF” as the destination to keep a copy. Use portrait orientation, choose the same paper size you picked on the page (A4 or US Letter), and print at 100% scale rather than “fit to page” so the 20 mm line at the foot of the sheet measures 20 mm with a ruler. Because the diagram is a vector SVG, lines and labels stay crisp at any size, and the Download SVG button gives you a file you can edit or drop into slides.
Build a question sheet to go with itHow do I use a blank Punnett square?
Write one parent’s gametes along the top and the other parent’s down the left side, one allele (or one combination) per box. For a monohybrid cross such as Aa × Aa the 2 × 2 grid gives AA, Aa, Aa, aa; for a dihybrid cross such as AaBb × AaBb each parent contributes four gametes (AB, Ab, aB, ab), so the 4 × 4 grid has 16 boxes and yields the 9 : 3 : 3 : 1 ratio. Check your filled-in grid against the calculator.
Check your answers with the calculator