profile image
Number of items: 105
Date joined: Apr 04 2016

Jon Darkow has taught a variety of biology courses at the high school and college level for the past ...Read more Jon Darkow has taught a variety of biology courses at the high school and college level for the past 15 years at Seneca East High School and through Bowling Green State University. Currently, Jon teaches Biology, AP Biology, and Anatomy and Physiology. Additionally, he teaches Instructional Technologies to educators in Seneca County. Jon has a diverse academic training with a B.A. in Sociology from Ohio State University in 2000. He has a post-bachelors in Life Science Education and an M.Ed. in Curriculum and Instruction from Ashland University where he received The Most Outstanding Professional Educator Award in 2007. Jon Darkow was the 2016 recipient of the Outstanding Biology Teacher Award from the National Association of Biology Teachers. Jon is most interested in teaching scientific reasoning and systems thinking using system dynamics modeling. Hide full description


Jon Darkow's Work

#1

Photosynthesis Model

sim834218 runs
#2

Limiting Nutrients in Aquatic Ecosystems

Experiment with a variety of nutrients that are limited by different degrees in four different ecosy ... Read more
Experiment with a variety of nutrients that are limited by different degrees in four different ecosystems.
sim61746 runs
limiting nutrients ecosystem biology logistic growth
#3

White-Eyed Genetics

White-eyed is an allele that results in a fly white eyes. Wild-type variants have red eyes. The ... Read more
White-eyed is an allele that results in a fly white eyes. Wild-type variants have red eyes. The goal of this simulation is to determine the pattern of inheritance for the white-eyed phenotype. Is yellow body dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?
sim86871 runs
Genetics
#4

Lactase with Variable Sample Sizes

Arrayed Lactase Model
sim500743 runs
Lactase array sample size biology
#5

Thyroid Hormone - Negative Feedback

sim36423 runs
negative feedback thyroid hormone metabolism biology
#6

Population dynamics of white footed mouse

sim431754 runs
#7

Cellular Respiration Accounting Model

The purpose of the model is to understand how glucose is metabolized, and how the energy stored in i ... Read more
The purpose of the model is to understand how glucose is metabolized, and how the energy stored in its chemical bonds is transfered.
sim372225 runs
cellular respiration aerobic respiration ATP biology
#8

Growth Factors, Cyclins, and Cancer

Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (gro ... Read more
Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (growth factors), to stimulate the cell cycle feedback loops.
sim177554 runs
growth factors cyclins cell cycle cancer
#9

Guppy Evolution

sim86059 runs
evolution biology genes
#10

Extinction Vortex

sim22249 runs
#11

Student Model (X. Hicks and J. Margraf) - HIV

sim39 runs
#12

Evolution with Heterozygous Advantage

Evolution of Populations: Genetic Drift, Natural Selection, and Mutations
sim7315 runs
evolution natural selection genetic drift
#13

Apterous Genetics

Apterous is an allele that results in a fly without wings. Wild-type variants have normally function ... Read more
Apterous is an allele that results in a fly without wings. Wild-type variants have normally functioning wings. The goal of this simulation is to determine the pattern of inheritance for the apterous phenotype. Is apterous dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?
sim193804 runs
Genetics
#14

Circadian Clock in the Mouse

Transcriptional Translational Feedback Loop in the Mouse
sim22363 runs
Mouse Circadian Clock
#15

Stock, Inflow, and Outflow with Atrazine

Simple stock and flow diagram. Flows linear.
sim64 runs
stock flow atrazine
#16

ATP Hydrolysis

sim2052 runs
Science ATP Free Energy Entropy
#17

Chaos Theory: Strange Attractor

Manipulate the main variables of the Lorenz equation.
sim1355 runs
chaos theory Lorenz attractor manifold
#18

Evolving Bits N=40

sim1933 runs
evolution bits receptor substrate
#19

Oxytocin and Child Birth

sim127827 runs
#20

Beta Cell Simulation - Split story

sim28176 runs
#21

Photosynthesis with Variable Sample Sizes

Sample sizes of Photosynthesis stocks in an array
sim31874 runs, 58 downloads
Download Model
#22

Transformation Experiment with Controls

Simulation allows users to test the bacterial transformation principle discovered by Frederick Griff ... Read more
Simulation allows users to test the bacterial transformation principle discovered by Frederick Griffith.
sim10871 runs
Biology Science Education transformation DNA
#23

SIR COVID-19 Coronavirus Simulation

sim11121 runs
Environment Biology Science Education SIR
#24

Transformation Simulation

Simulation allows students to test the transformation principle. Two major goals of the experiment a ... Read more
Simulation allows students to test the transformation principle. Two major goals of the experiment are: 1. Allow users to see that supernatant from heat-killed bacteria can transform the genes of another bacterium. 2. What transforms the inheritance of the bacteria is DNA, not RNA or proteins.
sim89654 runs
transformation DNA biology
#25

Information Processing and Neurophysiology Model

The main dependent variable measured in the model is the membrane potential (millivolts) of two diff ... Read more
The main dependent variable measured in the model is the membrane potential (millivolts) of two different neurons in a series. You will be able to add excitatory and inhibitory neurotransmitters, and compare how these modulate electrical impulses of the two neurons. Additionally, you will be able to compare the effects of three neurotoxins: Tetrodotoxin, botulinum toxin, and sarin nerve gas. While extremely lethal, these toxins are very instructive in understanding neurons because of the specific way the toxins act. Each toxin modifies or inhibits a specific molecule in neurons that help process and transmit information.
sim109498 runs
infromation processing neurophysiology biology
#26

Pattern with recessive single band

sim59519 runs
genetics
#27

Tick Tock: The Biological Clock and Circadian Rhythm

Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circa ... Read more
Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circadian rhythm.
sim1079 runs
circadian clock feedback loop
#28

Cell Cycle - Simpler 2020

sim34926 runs
Biology Science Education
#29

Lactase Enzyme Simulation with Data Analysis

sim5716064 runs
#30

Grant Finches Mobile

sim15 runs
#31

HPV and Adaptive Immune Response

sim4590 runs
HPV Antibodies feedback loops vaccine
#32

Evolution of Antibiotic Resistance Simulation

Evolution of Antibiotic Resistance Simulation. This model tracks the accumulation of 40 colonies of ... Read more
Evolution of Antibiotic Resistance Simulation. This model tracks the accumulation of 40 colonies of bacteria. The main purpose of the model is to show that new adaptations are not caused by an environmental factor, like antibiotics. Rather, new adaptations are the selection of available variations. In this model you can increase variations by increasing the UV dose. The UV dose increases the mutation rate with a Monte Carlo function.
sim57641 runs
Biology Science Ecology Education
#33

Steady State in Freshwater Ecosystems

sim25119 runs
#34

Enzyme Diversity

sim260545 runs
enzyme biology substrate pepsin indicators
#35

Evolution and Natural Selection

sim209994 runs
#36

Enzyme Diversity: Enzymes, Products, and Substrates

sim494468 runs
enzymes substrates products DNA trypsin
#37

Cell Cycle Simulation

sim1543 runs
Biology
#38

Neurophysiology and Neurotoxicity

The main dependent variable measured in the model is the membrane potential (millivolts) of a motor ... Read more
The main dependent variable measured in the model is the membrane potential (millivolts) of a motor neuron and the muscle fiber it innervates. You will be able to add excitatory and inhibitory neurotransmitters, and compare how neurotransmitters modulate the electrical impulses of the motor neuron and the muscle fiber. Additionally, you will be able to compare the effects of four neurotoxins: Tetrodotoxin, botulinum toxin, sarin nerve gas, and VX. While extremely lethal, these toxins are very instructive in understanding neurons because of the specific way the toxins act. Each toxin modifies or inhibits a specific molecule in neurons that help process and transmit information.
sim46098 runs
Neurophysiology toxins sarin VX TTX
#39

The dynamics of photosynthesis - variable sample size

The dynamics of photosynthesis - variable sample size
sim82128 runs
photosynthesis sample size biology
#40

Phenology of the Karner Blue Butterfly

Karner Blue butterfly is an endangered species. Habitat loss and climate change are contributing fac ... Read more
Karner Blue butterfly is an endangered species. Habitat loss and climate change are contributing factors to the reduction in the butterflies' population sizes. Climate change can alter the timing of lifecycles. When climate change disproportionally affects the timing of life cycles of species in an ecosystem asynchrony within a food web occurs.
sim8391 runs
asynchrony timing phenology climate change butterfly
#41

Lac Operon with Monod Bump

sim120016 runs
Lac Operon Gene Regulation mRNA
#42

Water Potential and Osmosis

Factors that affect the flow across a semi-permeable membrane.
sim210532 runs
#43

Evolution: Grants Finches

Models the effects on population sizes of ground finches with different beak sizes in response to di ... Read more
Models the effects on population sizes of ground finches with different beak sizes in response to different amounts of annual precipitation.
sim6819 runs
evolution biology natural selection
#44

Evolving Bits

Diversity and selection for the basis of evolution. This simple model tries to illustrate these conc ... Read more
Diversity and selection for the basis of evolution. This simple model tries to illustrate these concepts.
sim1512 runs
Diversity Selection Evolution Receptor Antigen
#45

Fruit Fly Choice

Simulation to model random behavior in a fruit fly choice chamber
sim733 runs
randomness random
#46

Lactose Operon: An Inducible System

In this simulation users explore the negative feedback system of the Lactose Operon found in bacteri ... Read more
In this simulation users explore the negative feedback system of the Lactose Operon found in bacteria. Lactose induces the system by inhibiting and inhibitor.
sim102845 runs
Inhibition negative feedback biology lactose operon
#47

Logistic Growth Model and the Butterfly Effect

Model allows users to test the starting population size (N), the carrying capacity of the populatio ... Read more
Model allows users to test the starting population size (N), the carrying capacity of the population (K), and the intrinsic rate of growth (r max). Iterations are discrete, not continuous.
sim2818 runs
logistic growth carrying capacity
#48

Phosphorus in Lake: Changes to Flows in a Dynamic System

This model allows users to experiment with a very simple dynamic system: one stock (Phosphorus in a ... Read more
This model allows users to experiment with a very simple dynamic system: one stock (Phosphorus in a lake), an inflow (added P/day), and an outflow (removed P/day). The flows can either be constant throughout the simulation run, or dynamic (changing throughout the simulation run.)
sim1232 runs
flows dynamic phosphorus
#49

Genotyping with Electrophoresis

sim29397 runs
biology inheritance DNA restriction enzyme
#50

Carbon Cycle Simulation

Simulation tracks the movement of carbon to and from the atmosphere in Gt C (and Gt CO2). Users can ... Read more
Simulation tracks the movement of carbon to and from the atmosphere in Gt C (and Gt CO2). Users can manipulate with graphical inputs the changes in fossil fuel emissions, land-use, and ocean sinks.
sim1722 runs
Environment Biology Science Ecology Education
#51

System Dynamics of Carbon Budget

Simulation of the system dynamics of the global carbon dioxide budget based on the work on systems d ... Read more
Simulation of the system dynamics of the global carbon dioxide budget based on the work on systems dynamics based on John Sternman (MIT) and Krytyna Stave (University of Nebraska)
sim13128 runs
system dynamics carbon climate
#52

Fruit Fly with variable sample size

sim43 runs
#53

GLUT and Insulin

sim20 runs
#54

Cardiovascular Model

sim0 runs 0 views
#55

Illusions and Assumptions

sim90 runs
Biology Science
#56

Photosynthesis Simulation - Simplified

sim28 runs
Environment Biology Science Ecology Education
#57

Extinction

sim0 views
#58

Predator Prey Model - Mobile

sim50 runs
Biology
#59

Carbon in the Atmosphere - Graphic Input constant

sim28 runs
#60

Photosynthesis Simulation with Variance

sim207801 runs
#61

Beta Cell Membrane Transport - Insulin Regulation

sim222 runs
Insulin Glucose Beta Cell
#62

Evolution of LAP Allele in Mussels

sim52950 runs
Evolution Natural Selection Cline
#63

Tryptophan Operon: A repressible system

sim51077 runs
#64

Simple Genetics

sim71694 runs
#65

Catastrophic Regime Change in Aquatic Ecosystems

sim42450 runs
Ecology
#66

Tesing Unknown Enzymes

sim135383 runs
enzymes
#67

Diffusion of a Spherical Cell

Why are cells small? This model allows users to see how the size of a sphere affects the rate of dif ... Read more
Why are cells small? This model allows users to see how the size of a sphere affects the rate of diffusion.
sim87930 runs
diffusion surface area volume radius
#68

Recombination and Gene Linkage

sim70703 runs
#69

Lotka-Volterra Predator-Prey Model

Explore my favorite aspect of system dynamics and a historic example. The homeostasis generated by t ... Read more
Explore my favorite aspect of system dynamics and a historic example. The homeostasis generated by the interconnections of a negative feedback loop governs much of life.
sim107061 runs
negative feedback loop Lotka-Volterra homeostasis predator-prey
#70

Cellular Respiration Inquiry

Model of the dynamics of the metabolism of one mole of glucose. Randomness is built into the computa ... Read more
Model of the dynamics of the metabolism of one mole of glucose. Randomness is built into the computations.
sim57003 runs
metabolism respriation ATP biology
#71

Exponential Growth

sim5728 runs
Biology Ecology
#72

HPV with Influenza A Humoral Immunity

Immune response of HPV
sim14796 runs
HPV antibodies biology Immunity
#73

Comparing COVID-19 with xxx

This model was copied from Jon Darkow:
model154 downloads
Download Model
Environment Biology Education
#74

insulin secretion

model61 downloads
Download Model
Biology
#75

Limiting Nutrients Model

model187 downloads
Download Model
Environment Ecology Education
#76

Primary Candidate Election Model

model120 downloads
Download Model
Education
#77

TSH-TH Feedback

model74 downloads
Download Model
Biology
#78

Signal Transduction Example

model72 downloads
Download Model
Biology Science
#79

TH v2

model63 downloads
Download Model
Biology
#80

Cellular Respriation: ID process flows

model75 downloads
Download Model
#81

Natural Selection Model v1

model132 downloads
Download Model
Biology
#82

Endocrine System Dynamics

This model shows how FSH regulates the reproductive cycle in females, and how diseases may emerge fr ... Read more
This model shows how FSH regulates the reproductive cycle in females, and how diseases may emerge from underproduction and excess production of the hormone. This model was developed for a high school Anatomy and Physiology class.
model131 downloads
Download Model
Biology Physiology Feedback
#83

Pop Growth v3

model75 downloads
Download Model
#84

OT Feedback

model83 downloads
Download Model
Biology
#85

Differential Reproduction, Natural Selection Model

This is the fourth model in a sequence of models to show the logic of natural selection, formalized ... Read more
This is the fourth model in a sequence of models to show the logic of natural selection, formalized by Earnst Mayr. Mayr E. The growth of biological thought. Cambridge: Harvard University Press; 1982.
model73 downloads
Download Model
Biology Science Education natural selection evolution
#86

Cardiac Myocytes

model117 downloads
Download Model
Biology Education
#87

CR and ATP coupled reaction

model70 downloads
Download Model
Biology
#88

Epinephrine Signal Transduction

model260 downloads
Download Model
Biology Science Education
#89

p53 and Cell Cycle

model112 downloads
Download Model
Biology
#90

Two Variations - Population Growth

model61 downloads
Download Model
Biology Science Ecology Education
#91

Pop Growth with Resources v2

model61 downloads
Download Model
#92

Stock and Flow Teaching

model46 downloads
Download Model
Education
#93

SIR Model for Coronavirus (COVID-19) - with social distancing

This model was copied from Jon Darkow:
model369 downloads
Download Model
Environment Biology Education
#94

SIR Model for COVID-19

This model was copied from Jon Darkow: This model was copied from Jon Darkow:
model57 downloads
Download Model
Environment Biology Education
#95

Cellular Respiration Matter

model120 downloads
Download Model
#96

Chapter 2.12

model307 downloads
Download Model
#97

Exponential Growth in Population - AF

Chapter 2: Modeling the Environment
model479 downloads
Download Model
#98

Hormone Sample 1

model116 downloads
Download Model
#99

Logistic Growth Model

model555 downloads
Download Model
#100

SIR Model for Coronavirus (COVID-19)

model1005 downloads
Download Model
Environment Biology Education
#101

Chapter 2: Population Growth

Chapter 2 introduction
model409 downloads
Download Model
#102

Pop Growth v2

model44 downloads
Download Model
#103

TH v3

model59 downloads
Download Model
Biology
#104

CLD Example

diagram126 downloads
Download Model
Biology
X

Sim App (Sim)

An interface that allows users to interact with a model.

Image of a sim

Sim apps allow users to interact with a model using buttons, sliders, knobs, tables, graphs, and storytelling. These interactions help users understand how parts of a system interact.

Interfaces are created by model authors in the Stella desktop software and can be uploaded to the isee Exchange™.

Model

A diagram that represents how elements in a system influence one another.

Image of a model

Models are mathematical representations of how elements in a system are connected and interact (e.g., ecosystems, organizations, supply chains). When running models on the isee Exchange™, results can be viewed in output devices like graphs and tables.

Models appear in the isee Exchange™ directory when authors upload them from the Stella® desktop software or create them with Stella Online™.

Causal Loop Diagram (CLD)

A map that represents the feedback structure of a system.

Image of a CLD

CLDs are high-level maps that represents the feedback structure of a system and easily communicate the essence of a model. They appear in the isee Exchange™ when authors upload them from the Stella desktop software or create them with Stella Online™.