This is what you would open on a Sunday night
Six students have submitted the same Biology free-response question. Each one already has a proposed score and a written reason for every rubric point. Expand one to see the argument you are being asked to accept, or approve the lot and move on.
The prompt they answered
A beetle population varies from light to dark. A researcher introduces a bird predator that hunts by sight on dark bark. Over 20 generations, allele frequencies for the color gene (D = dark, dominant; d = light, recessive) are tracked. (a) Predict how the frequency of D will change and explain the mechanism of natural selection. (b) In generation 1 the recessive light phenotype has frequency 0.16. Assuming Hardy–Weinberg equilibrium, calculate the D and d allele frequencies and the frequency of heterozygotes. (c) Describe ONE Hardy–Weinberg condition being violated and justify.
This is a sample class. Six invented students, real Biology prompts and real rubrics. The scores and justifications below were generated from those rubrics so this page works without an API key — in a live class they come from the model. Ticking and approving here changes nothing and saves nothing.
6 awaiting your approval
- Ada Okonkwosubmitted this weekself: 6/6 AI proposes 5/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Ada. Re: A beetle population varies from light to dark… I worked through each part in order.
- (a) The D allele frequency increases. On dark bark, dark beetles are camouflaged and eaten less by the visually hunting birds, while light beetles are more visible and preyed upon. Dark beetles survive to reproduce and pass D to offspring at a higher rate — differential reproductive success (natural selection) shifts frequencies toward D.
- (b) q² = 0.16 → q = 0.40; p = 1 − 0.40 = 0.60. I then checked my answer against the requirement in the question and made sure each part was addressed separately.
Ada Okonkwo scored 5/6. The reasoning is sound and the terminology is precise; the points lost went to compression rather than misunderstanding.
- 1/1(a) Predicts the D (dark) allele frequency increasesEarned — “Predicts the D (dark) allele frequency increases” is addressed directly, with the supporting reasoning on the page rather than assumed.
- 1/1(a) Explains dark beetles are better camouflaged, survive and reproduce more, passing D on (differential reproductive success)Earned — “Explains dark beetles are better camouflaged, survive and reproduce more, passing D on (differential reproductive success)” is addressed directly, with the supporting reasoning on the page rather than assumed.
- 1/1(b) Correct q = 0.4 and p = 0.6Earned — “Correct q = 0.4 and p = 0.6” is addressed directly, with the supporting reasoning on the page rather than assumed.
- 0/1(b) Correct heterozygote frequency 2pq = 0.48Not earned — the response moves past “Correct heterozygote frequency 2pq = 0.48” without attempting it.
- 1/1(c) Identifies a violated condition (no natural selection)Earned — “Identifies a violated condition (no natural selection)” is addressed directly, with the supporting reasoning on the page rather than assumed.
- 1/1(c) Justifies that predation causes non-random survival, so allele frequencies changeEarned — the response states “Justifies that predation causes non-random survival, so allele frequencies change” explicitly rather than leaving a reader to infer it.
What the student is told to do next- Answer every part of the prompt explicitly — label them (a), (b), (c) so nothing is skipped.
- State the reasoning that links your evidence to your claim; a reader cannot award a point for an implied step.
- Use the precise term the rubric uses rather than a synonym.
- Ben Ferreirasubmitted this weekself: 5/6 AI proposes 5/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Ben. Re: A beetle population varies from light to dark… I worked through each part in order.
- (a) The D allele frequency increases. On dark bark, dark beetles are camouflaged and eaten less by the visually hunting birds, while light beetles are more visible and preyed upon. Dark beetles survive to reproduce and pass D to offspring at a higher rate — differential reproductive success (natural selection) shifts frequencies toward D.
- (b) q² = 0.16 → q = 0.40; p = 1 − 0.40 = 0.60. I then checked my answer against the requirement in the question and made sure each part was addressed separately.
- Chidi Alvarezsubmitted this weekself: 4/6 AI proposes 4/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Chidi. Re: A beetle population varies from light to dark… I think the main idea is that
- (a) The D allele frequency increases. On dark bark, dark beetles are camouflaged and eaten less by the visually hunting birds, while light beetles are more visible and preyed upon. I was less sure about the later parts, so I described what I could and moved on.
- Dee Nakamurasubmitted this weekself: 4/6 AI proposes 4/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Dee. Re: A beetle population varies from light to dark… I think the main idea is that
- (a) The D allele frequency increases. On dark bark, dark beetles are camouflaged and eaten less by the visually hunting birds, while light beetles are more visible and preyed upon. I was less sure about the later parts, so I described what I could and moved on.
- Eli Rahmansubmitted this weekself: 4/6 AI proposes 3/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Eli. Re: A beetle population varies from light to dark… I think the main idea is that
- (a) The D allele frequency increases. On dark bark, dark beetles are camouflaged and eaten less by the visually hunting birds, while light beetles are more visible and preyed upon. I was less sure about the later parts, so I described what I could and moved on.
- Fay Lindqvistsubmitted this weekself: 2/6 AI proposes 1/6
Free response · Unit 7: Natural Selection & Evolution
- Synthetic response by Fay.
- Re: A beetle population varies from light to dark… I wasn't sure how to start this one.
- I know it involves unit 7: natural selection & evolution, and I tried to write what I remembered from the unit, but I couldn't connect it to the specific question.
What is real here and what is not
- Real: the prompt, the rubric, the maximum points, the screen, and the rule that nothing counts until a teacher approves it.
- Invented: the six students and their answers. Nobody wrote these.
- Generated, not model-written: the scores and justifications on this page are produced deterministically from the rubric text so the page works with no API key and reads the same for everyone. In a live class the model writes them, quoting the student’s actual words — better and more specific than what you see here, but the same shape and the same approval step.