Mutations & Genetic Variation
📋 What it is
A mutation is a change in DNA; it can be harmful, harmless, or (rarely) helpful.
🗣️ Coach says
A mutation is a typo in the DNA code. Most do nothing; some cause problems; and a rare few are helpful, giving a survival edge. Mutations are the raw material of variation — without them, evolution would have nothing new to work with. Change isn’t always bad.
🧠 Memory hook
Mutation = a DNA change. Usually harmless, sometimes harmful, rarely helpful.
😂 Giggle
What did the chromosome say during cell division?
"I'm splitting up — it's not you, it's mitosis!"
😲 Whoa!
The mutation that lets some adults digest milk spread widely because it was HELPFUL in dairy-farming cultures — a rare “good typo.”
✅ Quick check: Are all mutations harmful?
Say your answer out loud first — then reveal.
No — most are harmless, some are harmful, and a rare few are helpful and can spread by giving a survival advantage.
Mutations vary in effect; some provide beneficial variation.
🧪 Try it! (2 minutes)
Change ONE letter in a short word (CAT → COT). Small change, new meaning — that’s like a mutation.