Why Do People Have Different ‘Blood Types’ and What Does It Mean?

Imagine your blood is like a special code. Some people have the same code, so they can share blood easily. Others have different codes, and that’s why sometimes you can’t give them blood without causing problems. Scientists call these codes blood types.

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Examples

A child can have type A blood if one parent has type A and the other has type O.
Sometimes people with type B blood get sick after receiving type A blood.
You don’t always need to match blood types perfectly, some people can take a different kind.

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Categories: Biology · blood type,genetics,evolution,immune system,transplants