Hair is like a rope made of tiny threads called keratin. When your hair grows, the shape of these threads decides if it will be curly or straight. If your hair has a rounder thread, it’s more likely to curl up. If it's flatter, it stays straight. Just like how a rope with rounded strings looks wavy, and one with flat strings is smoother.
Examples
- Imagine your hair is like a piece of string, if it’s round, it stays straight; if it's oval, it curls up.
- Your curly-haired cousin gets that from their parents who both have curly hair, while you got straight hair from your mom and dad.
- If you look closely at a strand of your hair under a magnifying glass, straight hair looks like a circle, while curly hair looks more like an oval.
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See also
- Why Do Some People Have Naturally Blue Eyes?
- What is Genetic predisposition?
- What are genetic factors?
- What was Friedrich Miescher's contribution to science?
- Life without DNA?