Biology simulations
Enzymes, populations, photosynthesis and inheritance, modelled step by step so you can test an idea and see the result.
4 simulations · All simulations · Physics · Chemistry
Enzyme Activity
FREEDial up temperature, pH, substrate, and enzyme concentration and watch reaction rate rise and fall — with a saturation curve for substrate and a starch–iodine style colour change as the reaction progresses.
See what it does →
Genetic Crosses and Chance
ORBITPick a type of cross and the genotype of each parent, and see the exact Punnett square, the expected ratio and a random family of offspring drawn from it. Compare the counts with the ratio using a chi-squared test, and see how far chance moves a small family compared with a large one.
See what it does →
Photosynthesis and Respiration
FREEDial up light, CO₂, temperature, hours of daylight and chamber size, and watch a leaf in a sealed chamber photosynthesise in the light and respire all the time. Chamber CO₂ falls by day and rises by night, while a light-response graph shows where photosynthesis matches respiration and then levels off.
See what it does →
Population Growth
ORBITDial up starting population, growth rate, carrying capacity, and a harvesting/predation rate and watch a population trace the classic S-shaped curve toward its habitat's limit — or, if harvesting outpaces growth, decline toward extinction. Traced against an uncapped exponential comparison.
See what it does →