Have you ever noticed how members of a family look alike? Do your friends look like their parents? Do you look like anyone in particular?
Parents pass along many things to their children when their eggs and sperm cells come together. The eggs contain tiny things called genes. The sperm cells contain genes too. Each gene is like an order. Some genes are an order for height. Others are an order for hair colour. There are thousands of these orders. All together they tell a body how to grow into a special, one-of-a-kind person.
The things people do every day also make them who they are. For example, the things people eat have something to do with how tall or how big their bodies will be.
So what about you? Who will you look like? Some of your genes came from your father, so you will look a little like him. Some genes came from your mother, so you will look a little like her. Your parents got their genes from their parents, so you will look a little like your grandparents too. Mostly, you will look at exactly like YOU.
Have you ever seen a pair of sisters or brothers who look exactly alike? Two sisters or two brothers who look exactly alike are called identical twins. But not all twins look alike. Twins that don’t are called fraternal twins.
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