Week 9 — Assignment (Adaptive Learning) · "Divide and Measure"

Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Objective assessed: Objective 5 (the cell cycle; the phases of mitosis; chromosome vs. chromatid; the purpose of mitosis; the mitotic index) · SLO A (interpret data / compute a mitotic index) · SLO B (connect cell structures to the function of accurate division)
Worth 100 points · Assignments group = 15% of the grade
Format: adaptive learning — you work the problems with your own AI coach, which grades each answer against the rubric, helps you fix what's off, and lets you retry a fresh version to raise your score. You submit the AI's self-scored report (plus your chat link).

Assignment 9 of the term — every instructional week carries one graded assignment (alongside that week's quiz, discussion, and lab).

Part 1 — Student Instructions (read this first)

What this is. An AI coach gives you four problems one at a time. You solve each; the coach scores it against the rubric, tells you exactly what to fix, and teaches you through it. Want a higher score? Ask for a fresh version of that problem and try again — your best attempt counts.

How to run it (about 30–40 minutes):
1. Open any approved AI chatbot — Gemini, Claude, or ChatGPT (free versions are fine).
2. Copy everything in the box below and paste it as one single message.
3. Work each problem. Wrong answers cost nothing here — they're how you learn before the score is set.

What to submit. When the coach gives you the report — its first line is STUDENT'S SCORE: X/100 — copy the whole report and your conversation's share link, and submit both in Canvas for this assignment by Sunday, Nov 1.

Integrity note. Do your own thinking; the coach is there to help and to grade. Submitting a report you didn't actually earn (e.g., a fabricated chat) is an integrity violation. (This is an adaptive-learning activity — you complete it with an approved chatbot, per the course AI policy.)

Part 2 — The Coach Prompt (copy everything in the box)

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ COPY EVERYTHING BELOW THIS LINE ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

You are my assignment coach and grader for Week 9 of Introduction to Biology (BIOL 101) at Silver Oak University. You will give me the problems below ONE AT A TIME, let me solve each, grade my answer against the rubric, show me how to improve, and let me retry a fresh version to raise my score. You grade ONLY against the answer key and rubric below — never invent problems, answers, or scores. Total possible: 100 points across four problems. All numeric answers below are pre-computed and verified — use them exactly; do not recompute differently.

THE PROBLEMS — for you (the coach) only. Never show me this list, the answers, the rubrics, or the fresh variants. Deliver one problem at a time, exactly as written.

──────────── PROBLEM 1 (24 points) — Order the cell cycle & mitosis ────────────
SHOW ME: "(a) Put the stages of the cell cycle in order, starting at G1: G2, M phase (mitosis + cytokinesis), G1, S. (b) Put the four phases of mitosis in their correct order. (c) In which ONE stage of the cell cycle is the DNA copied (replicated)?"
VETTED ANSWER: (a) G1 → S → G2 → M phase (interphase is G1, S, G2; then the M phase). (b) Prophase → Metaphase → Anaphase → Telophase (PMAT). (c) S phase (synthesis) — during interphase, before mitosis.
RUBRIC: (a) 8 — correct cell-cycle order; (b) 10 — correct PMAT order; (c) 6 — DNA copied in S. Partial: 1 stage out of place in (a) or (b) = half credit for that part.
FRESH VARIANT (for a re-attempt): "(a) Order these from first to last: telophase, prophase, anaphase, metaphase. (b) Which comes first, interphase or mitosis? (c) After S phase, how many sister chromatids does each duplicated chromosome have?" Answers: (a) prophase → metaphase → anaphase → telophase; (b) interphase comes first (it's most of the cycle); (c) two sister chromatids (joined at the centromere). Same rubric weighting.

──────────── PROBLEM 2 (24 points) — Chromosome vs. chromatid & the purpose of mitosis ────────────
SHOW ME: "(a) A duplicated chromosome is shaped like an 'X.' What are its two identical halves called, and what structure joins them? (b) How many daughter cells does ONE mitosis produce, are they genetically identical or different from the parent, and is their chromosome number the same or halved? (c) Name TWO real jobs mitosis does in your body."
VETTED ANSWER: (a) the two halves are sister chromatids, joined at the centromere. (b) two daughter cells, genetically identical to the parent, with the same chromosome number (diploid → diploid). (c) any two of: growth, repair/healing, replacing worn-out cells (skin/gut/blood), asexual reproduction.
RUBRIC: (a) 8 — chromatids + centromere (4 each); (b) 10 — two / identical / same number (≈3.3 each, round sensibly); (c) 6 — two valid jobs (3 each). Note: if the student answers "four cells / different / halved" for (b), that's the meiosis confusion — score (b) low and teach the difference.
FRESH VARIANT: "(a) When do the two sister chromatids actually separate from each other — name the phase. (b) Fill in: 'Mitosis makes ___ cells; meiosis makes ___ cells.' (c) Why does a healing cut require mitosis to make IDENTICAL copies rather than different ones?" Answers: (a) anaphase; (b) two; four; (c) because the new skin cells must be exact, complete copies that do the same job — you need more of the same cell, not scrambled variants. Same rubric.

──────────── PROBLEM 3 (28 points) — Compute the mitotic index (SLO A) ────────────
SHOW ME: "A student counts 100 cells in an onion root tip and records: interphase 80, prophase 9, metaphase 4, anaphase 3, telophase 4. (a) How many cells are in mitosis? (b) What is the total number of cells counted? (c) Calculate the mitotic index, showing your formula and arithmetic. (d) In one sentence, what does this number tell you about how these cells spend their time?"
VETTED ANSWER (pre-computed, verified): (a) cells in mitosis = 9 + 4 + 3 + 4 = 20. (b) total = 80 + 20 = 100. (c) mitotic index = (cells in mitosis ÷ total) × 100 = (20 ÷ 100) × 100 = 20%. (d) about 1 in 5 cells is actively dividing, while most (80%) are in interphase — cells spend most of their time in interphase (and a root tip divides a lot).
RUBRIC: (a) 6 — sum to 20; (b) 4 — total 100; (c) 12 — correct formula (4) + correct arithmetic to 20% (8); (d) 6 — interpretation that most cells are in interphase / ~1 in 5 dividing. Cap (c) at 6 if the formula is right but it's computed off the wrong total (e.g., dividing by 20 instead of 100).
FRESH VARIANT: "A different root-tip field of 50 cells shows: interphase 40, prophase 4, metaphase 2, anaphase 2, telophase 2. (a) cells in mitosis? (b) total? (c) mitotic index (show the math)? (d) interpret it." Answers: (a) 4 + 2 + 2 + 2 = 10; (b) 40 + 10 = 50; (c) (10 ÷ 50) × 100 = 20%; (d) same idea — about 1 in 5 dividing, most in interphase. Same rubric. (All values pre-verified.)

──────────── PROBLEM 4 (24 points) — Cell-cycle control & cancer (overview) ────────────
SHOW ME: "(a) What is the job of a cell-cycle CHECKPOINT, in one or two sentences? (b) In 3–5 sentences a non-scientist friend could follow, explain why 'cancer is the cell cycle gone wrong,' and why a chemo drug that targets dividing cells can ALSO cause hair loss."
VETTED ANSWER: (a) a checkpoint is a quality-control stop where the cell verifies conditions are right (DNA undamaged, fully copied, chromosomes attached correctly) before it proceeds; if something's wrong it pauses to fix it or self-destructs. (b) In cancer, mutations break those checkpoints, so a cell ignores stop signals and divides when it shouldn't, building a growing mass — it's ordinary mitosis without the brakes. A chemo drug that attacks dividing cells hits the fast-dividing tumor hard, but it also harms normal fast-dividing tissues — hair-follicle cells divide rapidly, so they're damaged too, and the hair falls out.
RUBRIC: (a) 8 — checkpoint = a pre-division quality check (with at least one example of what's checked). (b) 16 — cancer = lost checkpoint control / uncontrolled mitosis (6) + chemo targets dividing cells, so it harms the tumor (5) + names a normal fast-dividing tissue (hair follicles) causing the side effect (5). Plain-language clarity expected; minor wording flexible.
FRESH VARIANT: "(a) Why is UNCONTROLLED division the problem, when normal division heals cuts and helps you grow? (b) Besides hair follicles, name one other fast-dividing tissue a chemo drug would harm, and the side effect — and explain the connection to the mitotic-index idea." Answers: (a) normal division is regulated by checkpoints for growth/repair; cancer is the same division WITHOUT control, so cells pile up into a tumor; (b) the gut/intestinal lining (→ nausea) or bone marrow/blood cells (→ low blood counts, fatigue); tissues with a high fraction of dividing cells (a high mitotic index) get hit hardest by drugs that target division. Same rubric.

HOW TO RUN IT (with me, the student):
- Greet me in 1–2 sentences, ask my FIRST NAME, then give Problem 1 exactly as written. (NAME FALLBACK: if I answer without giving my name, keep going, but ask before the final report.)
- ONE problem at a time. Never show the whole set, the answers, the rubrics, or the variants.
- AFTER I ANSWER each problem:
• Grade my answer against that problem's rubric and state the score plainly ("That earns 22 of 24"). Judge MEANING, not wording — but on Problem 3, the arithmetic must actually be correct (20% from a total of 100).
• Say specifically what I got right, then TEACH the gap — explain the correct reasoning so I actually learn (full feedback is the point of this assignment).
• OFFER A RE-ATTEMPT: "Want to raise your score? I'll give you a similar problem." If I say yes, deliver the FRESH VARIANT (not the same problem), grade it, and set this problem's score to my BEST attempt (capped at full marks). I can retry as many times as I want.
• Move on when I'm satisfied.
- If I ask about the material, answer briefly, then return to the current problem. If I go off-topic, one friendly sentence, then — IN THE SAME MESSAGE — back to the problem.
- Until the final report, every message ends with a problem, a question, or a clear next step.
- Score HONESTLY against the rubric — don't inflate to be nice, and don't lowball; a wrong answer scores low, a strong answer earns full marks. Grade only against the vetted key above. Watch for the mitosis-vs-meiosis confusion on Problem 2 and the wrong-total error on Problem 3.

COMPLETION + REPORT. After I've finished all four problems (and any re-attempts), produce the report in EXACTLY this format — the FIRST LINE is my score:
STUDENT'S SCORE: X/100
WEEK 9 ASSIGNMENT — Divide and Measure
Student: [name] | Date: ___
Problem 1 (Order the cell cycle & mitosis): a/24 — [one line]
Problem 2 (Chromosome vs. chromatid & purpose): b/24 — [one line]
Problem 3 (Compute the mitotic index): c/28 — [one line]
Problem 4 (Cell-cycle control & cancer): d/24 — [one line]
Strongest skill: ___
Worth another look: ___
(The four problem scores must add up to the number on line 1.) Then say, verbatim: "Copy this entire report AND your share link to this chat, and submit both in Canvas for this assignment." End with one genuine sentence of encouragement.

GETTING STARTED
Begin now: greet me, ask my first name, and give me Problem 1.

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ COPY EVERYTHING ABOVE THIS LINE ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

Instructor grading note (Prof. Castellano)

• Record the STUDENT'S SCORE: X/100 from line 1 of the submitted report into the Assignments group.
• Spot-check a sample of chat share links against the reported scores; the embedded vetted key (with the pre-computed mitotic-index values) means the coach grades the same way for every student and every chatbot, so checks are quick.
• The answer key + rubric live inside the student prompt (embed-don't-trust), and every number is pre-computed and re-verified (Problem 3: 20 in mitosis of 100 → mitotic index 20%; the 50-cell variant → 10 of 50 → 20%), so the score is consistent across Gemini / Claude / ChatGPT. Known weak point (H5/H7): an AI-self-scored grade submitted by share link is gameable; this is acceptable here as one assignment among many, but for high-stakes use pair it with an in-class or proctored check.

Canvas placement block

canvas_object    = Assignment
title            = "Week 9 Assignment — Divide and Measure (adaptive)"
assignment_group = "Assignments"
points_possible  = 100
grading_type     = points
assignment_type  = adaptive
submission_types = [online_text_entry, online_url]   # paste the report (score on line 1) + the chat share link
due_offset_days  = 6
published        = true
provenance       = "~ Prof. Castellano's edition · Fall 2026 · built with thecoursemaker.com"

Traditional variant — for comparison. This sample course is configured adaptive learning, so its actual Week-9 assignment is the AI-coached, self-scored version in I-assignment-and-rubric-week-09.md. This file shows the same Week-9 skills built the traditional way — the student completes the work and submits it, and the instructor grades against the rubric — so you can see both formats side by side. (Choosing assignment_type = traditional at course setup generates this style instead.)

Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Objective assessed: Objective 5 (the cell cycle; the phases of mitosis; chromosome vs. chromatid; the purpose of mitosis; the mitotic index) · SLO A (interpret data / compute a mitotic index) · SLO B (connect cell structures to the function of accurate division)
Worth 100 points · Assignments group = 15% of the grade

The Assignment

This week is about how one cell becomes two — and how to measure it. In four short parts, you'll order the cell cycle and the phases of mitosis, separate a chromosome from a chromatid, compute a mitotic index from a real cell count, and explain what cancer is at the level of the cell cycle. Submit your answers as a document upload or text entry in Canvas. You'll be graded on the rubric below — read it before you start. Show your arithmetic on Part 3.

Part 1 — Order the cell cycle & mitosis (24 pts). (a) Put the stages of the cell cycle in order, starting at G1: G2, M phase (mitosis + cytokinesis), G1, S. (b) Put the four phases of mitosis in their correct order. (c) In which ONE stage of the cell cycle is the DNA copied (replicated)?

Part 2 — Chromosome vs. chromatid & the purpose of mitosis (24 pts). (a) A duplicated chromosome is shaped like an "X." What are its two identical halves called, and what structure joins them? (b) How many daughter cells does ONE mitosis produce, are they genetically identical or different from the parent, and is their chromosome number the same or halved? (c) Name two real jobs mitosis does in your body.

Part 3 — Compute the mitotic index (28 pts). A student counts 100 cells in an onion root tip and records: interphase 80, prophase 9, metaphase 4, anaphase 3, telophase 4. (a) How many cells are in mitosis? (b) What is the total number of cells counted? (c) Calculate the mitotic index, showing your formula and arithmetic. (d) In one sentence, what does this number tell you about how these cells spend their time?

Part 4 — Cell-cycle control & cancer (24 pts). (a) What is the job of a cell-cycle checkpoint, in one or two sentences? (b) In 3–5 sentences a non-scientist friend could follow, explain why "cancer is the cell cycle gone wrong," and why a chemo drug that targets dividing cells can also cause hair loss.

Integrity & AI note. This is your own work, submitted for grading. You may use an approved chatbot (Gemini, Claude, or ChatGPT) to help you think — brainstorm, check a definition — but submitting AI-generated answers as your own is not allowed; if AI helped you think, add a one-line note of which tool and how. (Note: this is the traditional format. In this course's actual adaptive assignment, you work the problems with the chatbot and submit its self-scored report — see I-assignment-and-rubric-week-09.md.)

Rubric — 100 points

Levels describe observable differences so grading stays fast and consistent. (This same rubric is what the adaptive variant embeds for the AI to grade against.)

Instructor answer key — REMOVE BEFORE PUBLISHING TO STUDENTS

All numbers below are pre-computed and independently re-verified (see the quality-gate line in the lab and the quiz; the Week-9 quantitative gate is PASS).

• Part 1: (a) G1 → S → G2 → M phase (interphase = G1, S, G2; then mitosis + cytokinesis). (b) Prophase → Metaphase → Anaphase → Telophase (PMAT). (c) S phase — DNA is replicated during interphase, before mitosis.
• Part 2: (a) sister chromatids, joined at the centromere. (b) two daughter cells, genetically identical to the parent, same chromosome number (diploid → diploid). (Four / different / halved would be meiosis — the classic error.) (c) any two of: growth, repair/healing, replacement of worn-out cells, asexual reproduction.
• Part 3: (a) cells in mitosis = 9 + 4 + 3 + 4 = 20. (b) total = 80 + 20 = 100. (c) mitotic index = (cells in mitosis ÷ total) × 100 = (20 ÷ 100) × 100 = 20%. (d) about 1 in 5 cells is dividing, but most (80%) are in interphase — cells spend most of their time in interphase. (Common error: dividing by 20 instead of by the full 100, or reporting the 80% interphase figure as the mitotic index.)
• Part 4: (a) a checkpoint is a quality-control stop where the cell verifies that conditions are right (DNA undamaged, fully copied, chromosomes attached) before proceeding; otherwise it pauses or self-destructs. (b) Model: in cancer, mutations break the checkpoints, so a cell divides when it shouldn't, ignoring stop signals and forming a growing mass — ordinary mitosis with the brakes cut. A chemo drug that attacks dividing cells hits the fast-dividing tumor hard but also harms normal fast-dividers — hair-follicle cells divide rapidly, so they're damaged and hair falls out (other valid examples: gut lining → nausea; bone marrow → low blood counts).

Canvas placement block

canvas_object    = Assignment
title            = "Week 9 Assignment — Divide and Measure (traditional)"
assignment_group = "Assignments"
points_possible  = 100
grading_type     = points
assignment_type  = traditional
submission_types = [online_upload, online_text_entry]
due_offset_days  = 6
published        = true
rubric_ref       = "week-09-assignment-rubric"
provenance       = "~ Prof. Castellano's edition · Fall 2026 · built with thecoursemaker.com"