What are chromosomes?

Chromosomes are like little instruction books that live inside your body’s cells.

Imagine you have a toy box full of different kinds of toys, each toy helps you play a certain game. Your chromosomes are like those toy boxes, but instead of toys, they hold special messages called genes. These messages tell your body how to grow and work properly.

Every time your body makes a new cell (like when you're growing taller), it uses these little instruction books to copy all the important information inside them. That way, every new cell knows exactly what to do!

Think of chromosomes like a recipe book for making cookies, if you have the right ingredients and instructions, you get delicious cookies. If your chromosomes are missing a page or have a typo, it might make your cookie (or your body) a little different.

Sometimes, when you get a new instruction book, you might swap out one toy box for another, that’s how you can end up with different traits, like blue eyes instead of brown ones.