Students model natural selection as predators, explain it in steps, reject the idea that individuals change because they need to, and connect it to common ancestry and the tree of life (AC9S10U02, node 2, a hinge node).
Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.
Engage and Explore 9 min · Explain 11 min · Evaluate 3 min · Typical adds 4 min, Wider about 1 min
A concept tutorial for introducing or revising the idea; it pairs well with the classic peppered moth story and a paper-dots predation game. Set the width with ?width=minimum, typical (default) or wider.
The hinge misconception is need-driven change ("the beetles turned dark to hide"). The Engage question puts it directly, and the board never changes a beetle's colour.
Closing the loop with Year 7: the last three Explain questions take natural selection to common ancestry (a branching tree, not a ladder; DNA similarity tracks how recently species shared an ancestor) and back to the Year 7 Kingdoms lesson, where students met the idea that kingdoms sort by features, not relatedness. This supports the descriptor's "explain past and present diversity" and prepares the evidence for evolution.
Board notes: half the beetles are eaten each generation; survivors breed back to the full number, and each offspring gets the average of two parents' colours plus a small random change (a stand-in for many genes and mutation). The automatic birds favour beetles that contrast with the ground but also eat some at random. Results vary from run to run; with student hunting, a student who clicks randomly sees little change, which is a good discussion point.
Saying the population changed, not the beetles. When a student says the beetles adapted, ask whether any one beetle changed its own colour.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says humans are the most evolved species. | How long has a chimpanzee's line, or a mushroom's, been evolving? | Exactly as long as ours. Evolution branches in many directions; there is no top. |
| A student's average barely moved. | Which beetles did you eat first? | If you click at random, there is no selection. Hunt like a bird: the easiest to see first. |
| A student says the beetles 'adapted to survive'. | Did any one beetle change? | No: say 'the population became better adapted because more of the well-camouflaged beetles survived and bred'. |
One possible solution for each task. Other correct programs are fine.
Open task: any program that does what the step asks.
Open task: any program that does what the step asks.
Stretch: Why does natural selection take many generations, not one?
Support: Give the five steps on cards to order before writing.
For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.
You are a patient science coach for a Year 10 student in Australia. Help me understand ONE idea only, from the lesson "Why did the beetles change?". The idea: Natural selection as a mechanism — variation, selection pressure, differential survival: I can describe the mechanism of natural selection: how a selection pressure acts on heritable variation to produce differential survival and reproduction, leading to population change over generations. What understanding looks like: - Describes the mechanism of natural selection as variation → selection pressure → differential survival/reproduction → inherited by offspring - Applies the mechanism correctly to a named example - Distinguishes natural selection from the Lamarckian view that individuals adapt during their lifetime Mistakes students often make here: - A student says humans are the most evolved species. - A student's average barely moved. - A student says the beetles 'adapted to survive'. How to coach me (rules from the Waypoints Kit coach): - Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question. - Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit). - If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go. - If I seem to be missing the idea that comes before this one (Variation within populations), check it quickly, then come back. - Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back. - After you help, ask me one reflective question, such as how I know my answer is right or what I would check. - Praise my effort and method, not my ability. - You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so. - Use simple words. - Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Why did the beetles change?".
Explain why the beetle population got paler on pale ground.
Beetles varied in colour; birds ate the darker, more visible ones; paler beetles survived and bred, passing on their colour; over generations, the average colour got paler.
Later: evidence for evolution (fossils, comparative anatomy, DNA) in more depth, and speciation, if your program covers them. Year 7 Kingdoms is the earlier half of the classification thread.
In class: the paper-dots predation game on newspaper and plain paper; antibiotic resistance as a case study.