Biology posters
LearnPosters has 100 free printable biology posters, grouped into 7 topics: Cell biology, Genetics, Physiology, Microbiology, Ecology. The mechanisms, cycles and diagrams a biology degree assumes. They are made for undergraduates, professionals and anyone revising the subject. Every one downloads as a vector PDF that prints sharp on US Letter, A4 or a copy-shop A1. No account and no watermark.
From molecules to ecosystems — cell biology, genetics, physiology, evolution and ecology, each reduced to what you actually need at a glance.
100 free printable posters · 7 topics · vector PDF
Cell biology
Organelles, membranes, respiration and division.
Prokaryotes & Eukaryotes
The fundamental division of cellular life, and what separates them.
Organelles
Every organelle and what it does, in one table.
The Cell Membrane
The fluid mosaic model, and what crosses it how.
Cellular Respiration
The four stages, where each happens, and the ATP yield.
Photosynthesis
The two stages, and what each one produces.
Mitosis
The phases, and what the chromosomes are doing in each.
Meiosis
Two divisions, four haploid cells, and the two sources of variation.
DNA Replication
Semi-conservative replication, and why one strand is made in pieces.
Transcription & Translation
How a gene becomes a protein, in two stages.
Enzymes
How enzymes work, and what changes their rate.
Cell Signalling
How cells communicate, and the steps from signal to response.
Cell Cycle Control
The checkpoints, and what happens when they fail.
Stem Cells
The potency levels, and what each can become.
Microscopy
The techniques, their resolution, and what each can show.
Differentiation
How identical cells become different, with the same genome.
Genetics
Inheritance, DNA, expression and mutation.
Mendelian Inheritance
The two laws, and the monohybrid cross that demonstrates them.
Genetics Vocabulary
The terms every genetics question assumes you know.
Beyond Mendel
The patterns that do not give simple dominant-recessive ratios.
Pedigree Analysis
Reading a family tree, and identifying the inheritance pattern.
Mutations
The types of mutation, and their effect on the protein.
Regulating Gene Expression
How cells control which genes are on, and when.
PCR
Amplifying DNA, and the three temperature steps that do it.
Gel Electrophoresis
Separating DNA by size, and how to read the result.
Genetic Engineering
Moving a gene into another organism, step by step.
CRISPR-Cas9
How targeted gene editing works, and what it can and cannot do.
DNA Sequencing
How a sequence is read, from Sanger to modern methods.
Genetic Disorders
The main inheritance patterns, with an example of each.
Hardy-Weinberg
The equilibrium equation, and the assumptions it requires.
Epigenetics
Heritable changes in gene expression without changes to the sequence.
Genomics & Ethics
What genomic data enables, and the questions it raises.
Physiology
How organ systems maintain the body.
Homeostasis
Negative feedback, and the four components every control loop needs.
Blood Glucose Control
Insulin, glucagon, and the two directions of the loop.
The Nephron
Filtration, reabsorption and secretion, region by region.
Gas Exchange
The features that make an exchange surface efficient, and where they appear.
The Circulatory System
Double circulation, vessel structure, and why each vessel is built as it is.
The Cardiac Cycle
The stages of one heartbeat, and what controls the rhythm.
The Nerve Impulse
The action potential, plotted and explained.
Muscle Contraction
The sliding filament theory, step by step.
Digestive Enzymes
Which enzyme acts where, on what, and produces what.
The Immune Response
Humoral and cell-mediated immunity, and how memory works.
Hormonal Control
How hormones differ from nerves, and the main axes.
Thermoregulation
How core temperature is held near 37°C, in both directions.
Osmoregulation
Controlling water balance, and the hormone that does it.
Transport in Plants
Xylem and phloem, and the mechanisms that move each.
Microbiology
Bacteria, viruses, fungi and immunity.
Bacterial Structure
The parts of a bacterial cell, and which are drug targets.
Gram Staining
What the stain distinguishes, and why it matters clinically.
Bacterial Growth
The growth curve, and what limits each phase.
Viruses
What a virus is, and why it is not usually called alive.
Viral Replication
The lytic and lysogenic cycles, and what distinguishes them.
How Antibiotics Work
The main targets, and why each is selective.
Antibiotic Resistance
How resistance arises and spreads, and why it is inevitable.
Aseptic Technique
The practices that prevent contamination in a microbiology lab.
Industrial Microbiology
What microbes are used to make, and how the process is run.
The Microbiome
The microbial communities on and in the body, and what is established.
Fungi & Protists
Two kingdoms often skipped, and what distinguishes them.
Pathogens
The types of pathogen and their routes of transmission.
Immunisation
How population immunity works, and the thresholds involved.
Sterilisation & Disinfection
The methods, what each kills, and where each is used.
Ecology
Populations, communities and energy flow.
Levels of Organisation
From individual to biosphere, and what each level studies.
Energy Flow
Why food chains are short, and where the energy goes.
Nutrient Cycles
Carbon and nitrogen, and the processes that move each.
Population Growth
Exponential and logistic growth, and what carrying capacity means.
Species Interactions
The interaction types, classified by who benefits.
Succession
How communities change over time, and where each type starts.
Measuring Biodiversity
Richness against diversity, and the index that combines them.
Ecological Sampling
The techniques for estimating populations without counting everything.
Ecosystem Services
What ecosystems provide, grouped into four categories.
Conservation
In situ and ex situ approaches, and what each achieves.
Climate & Ecosystems
The ecological consequences that are well documented.
Food Webs
Why webs are more realistic than chains, and what a keystone species does.
Pollution Effects
The main pollutant types and the mechanism of harm for each.
Carbon in Ecosystems
Where carbon is stored, and what happens when a store is disturbed.
Evolution
Selection, speciation and phylogeny.
Natural Selection
The four conditions, all of which must hold.
Types of Selection
Three patterns, and what each does to the distribution.
Speciation
How one species becomes two, and the barriers involved.
Evidence for Evolution
The independent lines of evidence, and why convergence matters.
Homology & Analogy
Shared ancestry against shared pressure — two ways structures look alike.
Phylogenetic Trees
How to read a tree, and the mistakes readers make.
Genetic Drift
Random change in allele frequency, and when it dominates selection.
Common Misconceptions
The errors that appear in almost every student answer.
Human Evolution
The main hominin species, and the traits that distinguish them.
Coevolution
Species evolving against each other, and the arms races that result.
Mimicry & Camouflage
The strategies, and the difference between the two main mimicry types.
Adaptations
The three categories, and the trade-offs adaptations always carry.
Artificial Selection
Selective breeding, and what it demonstrates about natural selection.
Classification
The taxonomic hierarchy, and how naming works.
Biochemistry
Biomolecules, enzymes and metabolic pathways.
The Four Biomolecules
Carbohydrates, lipids, proteins and nucleic acids, and their monomers.
Carbohydrates
From monosaccharides to polysaccharides, and how structure fits function.
Lipids
Triglycerides and phospholipids, and why the difference matters.
Protein Structure
Four levels of structure, and what holds each together.
Amino Acids
The general structure, and what the R group determines.
Enzyme Kinetics
Michaelis-Menten, and what Km and Vmax actually tell you.
ATP
Why ATP is the energy currency, and what makes it suitable.
Chemiosmosis
How a proton gradient becomes ATP, in mitochondria and chloroplasts.
Metabolic Pathways
Anabolism and catabolism, and how pathways are regulated.
Water
The properties that make water essential, and the reason for each.
pH & Buffers
The pH scale, and how biological systems resist change.
Food Tests
The standard qualitative tests, and the positive result for each.
Chromatography
Separating a mixture, and calculating Rf.
Respiration & Photosynthesis
The two central pathways compared, and how they connect.
Questions about the Biology posters
- What is the Biology section of LearnPosters?
- The mechanisms, cycles and diagrams a biology degree assumes. From molecules to ecosystems — cell biology, genetics, physiology, evolution and ecology, each reduced to what you actually need at a glance.
- What topics do the Biology posters cover?
- 100 posters across 7 topics. Cell biology — Organelles, membranes, respiration and division. Genetics — Inheritance, DNA, expression and mutation. Physiology — How organ systems maintain the body. Microbiology — Bacteria, viruses, fungi and immunity. Ecology — Populations, communities and energy flow. Evolution — Selection, speciation and phylogeny. Biochemistry — Biomolecules, enzymes and metabolic pathways.
- Who are the Biology posters for?
- The biology charts are pitched at undergraduates and professionals — the frameworks and equations a course keeps returning to. Nothing here is tied to a school year, so a curious beginner and someone revising the same material for an exam are looking at the same biology chart.
- Which Biology poster should I print first?
- Prokaryotes & Eukaryotes, Organelles and The Cell Membrane are the ones people reach for first — they are the references the rest of the biology set assumes you already have on the wall.Prokaryotes & EukaryotesOrganellesThe Cell Membrane
- Are the Biology posters free to print?
- Yes — all 100 of them. Each biology poster is a free vector PDF that needs no account, prints on US Letter or A4, and enlarges to A1 without softening. Home, classroom, library and tutoring use are all covered by the licence.Read the licence
Where the biology charts come from
These posters summarise. When you need the full account — or the normative text a chart is compressing — start here.
- NCBI — US National Center for Biotechnology Information. Sequence, gene and literature databases behind the genetics charts.
- Cell biology — Wikipedia. Organelle names, functions and the microscopy behind the diagrams.