Students relate DNA, chromosomes, genes and alleles by size and meaning, and explain chromosome pairs (AC9S10U01, node 1, 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 6 min · Explain 9 min · Evaluate 3 min · Typical adds 2 min, Wider about 1 min
A concept tutorial for introducing or revising the idea; it does not replace a DNA extraction practical (strawberries or kiwifruit). Set the width with ?width=minimum, typical (default) or wider.
The hinge misconceptions are confusing gene, chromosome and DNA, and thinking there is a separate gene for each version of a characteristic.
Board notes: the zoom is not to scale; the nucleus shows only some chromosomes; the base sequence shown is illustrative, not a real gene.
Keeping DNA, gene, chromosome and allele apart by size and job. When the words blur, ask which one is inside which, before naming any of them.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says a chromosome and DNA are different things. | What did you see when you zoomed into the chromosome? | A chromosome is DNA, tightly coiled. |
| A student says there's a gene for blue eyes and a gene for brown. | Is it the same section of DNA, in a different version? | Yes: one gene, different alleles. |
Stretch: The four bases pair up A with T and C with G. Why might that help a cell copy its DNA?
Support: Give a nested-boxes diagram with the five words to place.
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 "Where are the instructions?". The idea: Chromosomes, DNA and genes — the structural hierarchy: I can describe the structural relationship between chromosomes, DNA and genes, and explain how genetic information is organised and stored. What understanding looks like: - Describes chromosomes as structures made of DNA - Explains that genes are segments of DNA that code for heritable characteristics - Distinguishes genotype (genetic information) from phenotype (expressed characteristic) Mistakes students often make here: - A student says a chromosome and DNA are different things. - A student says there's a gene for blue eyes and a gene for brown. 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. - 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 "Where are the instructions?".
What's the difference between a gene and an allele?
A gene is a section of DNA coding for a protein; an allele is one version of that gene.
Next: meiosis (node 3) and Punnett squares (node 4).
In class: DNA extraction from strawberries.