Can you curl your tongue? Are your earlobes attached to your face? Do you have a curved pinky on your left hand, just like your uncle?

If the answer to any of these questions is yes, then you can thank your genes. Genes are the building blocks inside our bodies that show themselves as traits outside of our bodies. Many traits, like your physical appearance, are inherited from your parents – who inherited them from their parents – through your genes. And often it’s not just one gene that does the job; most traits are caused by a set of genes, and some genes can determine several different traits.

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