Week 15 — Readings & Resources · Gene Regulation, Mutation & Biotechnology

Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Objective covered: Objective 8 — Explain gene regulation, classify mutations and their effects, and describe the core tools of biotechnology (PCR, gel electrophoresis, recombinant DNA, CRISPR).

How to use this page

Everything here is a link to an external resource — open it in your browser, the same way you'd open a YouTube link. Nothing needs to be downloaded.

This week's load is deliberately light: 3 short videos + 2 short readings, grouped by the ideas from the lecture, plus optional references (including the one that anchors this week's discussion). Watch or read one item per group and you're ready for the quiz; do all of them and you'll be very comfortable. Total time is roughly 35–45 minutes if you do everything, far less if you pick one per group.

Order that matches the lecture: ① gene regulation (same DNA, different genes on) → ② mutations & their effects → ③ the biotechnology toolkit (PCR, gel, recombinant DNA, CRISPR) → ④ gene-editing ethics (for the discussion).

A habit to start now: before you trust any biology claim — in these resources or anywhere — ask the questions from class: Is this regulation or mutation? Which tool copies and which sorts? Smaller fragments travel which way in a gel?

① Gene Regulation · Same DNA, Different Genes On

Maps to Lecture Segment 2. Every cell carries the same DNA but expresses only a subset of its genes; the lac operon is the classic on/off switch.

Video — "Gene Regulation and the Operon" (Amoeba Sisters)
🔗 https://www.youtube.com/watch?v=h_1QLdtF8d0
Why it earns the click: a friendly tour of gene expression and the lac operon in bacteria — how genes get turned "on" and "off," exactly the thermostat idea we built in class. Makes the "same DNA, different genes ON" point concrete.
⏱ ~7 min

Reading — "Regulation of Gene Expression" (OpenStax Biology 2e, §16.1)
🔗 https://openstax.org/books/biology-2e/pages/16-1-regulation-of-gene-expression
Why it's assigned: the cleanest plain-language version of why cells don't express every gene all the time, and how prokaryotic vs. eukaryotic regulation differ — free to read online, no account needed. (Read the intro and the prokaryotic part; the deeper eukaryotic levels are beyond our scope.)
⏱ ~10 min

② Mutations & Their Effects

Maps to Lecture Segment 3. A mutation is a change in the DNA sequence — point (silent / missense / nonsense) or frameshift (insertion/deletion) — with effects ranging from neutral to harmful to beneficial.

Video — "Mutations (Updated)" (Amoeba Sisters)
🔗 https://www.youtube.com/watch?v=vl6Vlf2thvI
Why it earns the click: walks through gene and chromosome mutations and the significance of these changes, with the same vocabulary we used — and it makes the key point that mutations aren't all "bad." Exactly Segment 3.
⏱ ~7 min

③ The Biotechnology Toolkit · PCR, Gel, Recombinant DNA & CRISPR

Maps to Lecture Segments 5–6. PCR copies DNA; gel electrophoresis sorts DNA by size (smaller travels farther); recombinant DNA/plasmids splice genes together; CRISPR edits DNA.

Video — "Genetic Engineering" (Amoeba Sisters)
🔗 https://www.youtube.com/watch?v=CDw4WPng2iE
Why it earns the click: introduces the biotech toolkit — plasmids, vectors, transgenic organisms, and CRISPR — plus a short, fair look at the ethics (great prep for this week's discussion). Covers how a human gene goes into bacteria to make insulin.
⏱ ~8 min

Reading — "Biotechnology" (OpenStax Biology 2e, §17.1)
🔗 https://openstax.org/books/biology-2e/pages/17-1-biotechnology
Why it's assigned: the plain-language reference for working with nucleic acids — PCR, gel electrophoresis, and recombinant DNA / cloning — the same tools we walked through in class. Free to read online.
⏱ ~10 min

Video (gel focus) — "Gel Electrophoresis" (Amoeba Sisters)
🔗 https://www.youtube.com/watch?v=ZDZUAleWX78
Why it earns the click: the most useful video for this week's lab — it shows how a gel sorts molecules by size, spells out longer vs. smaller DNA fragments (smaller travel farther), and ends on DNA fingerprinting. Watch this before you run the virtual gel.
⏱ ~9 min

④ For the Discussion · Gene Editing & DNA in the Courtroom (optional but recommended)

Maps to Lecture Segment 7. The science constrains the ethics but doesn't settle them — these resources give you the real cases behind this week's debate.

• Learn.Genetics (University of Utah) — "Can DNA Demand a Verdict?" A clear, balanced look at how DNA profiling (DNA fingerprinting) is used in forensics — including PCR amplification of trace evidence, the role of human error, and wrongful-conviction exonerations. Excellent grounding if you choose the DNA-fingerprinting angle in the discussion.
  🔗 https://learn.genetics.utah.edu/content/science/forensics/

Optional one-stop references (free online)

• Khan Academy — Gene expression and regulation. A free unit with short articles and videos on regulation, operons, mutations, and biotechnology. A good place to return to as you review for the final.
  🔗 https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation
• OpenStax Biology 2e — Chapter 16 introduction (Gene Expression). A one-page overview of why the same DNA produces different cell types — the framing for the whole week. Free to read online.
  🔗 https://openstax.org/books/biology-2e/pages/16-introduction

Pick-one quick path (≈16 min total)

In a hurry? Do exactly these two and you'll be ready for the quiz:
1. Watch "Mutations (Updated)" (group ②).
2. Watch "Gel Electrophoresis" (group ③) — it covers the gel rule (smaller travels farther) and DNA fingerprinting you'll need for the lab and quiz.

Heads-up (links rot): these point to outside sites that occasionally move or rename pages. If a link ever fails, tell Prof. Castellano and use the OpenStax or Khan Academy references above in the meantime.