Asked by: Pete Garibaldi, Kettering
A chin dimple, or cleft chin, can be hereditary, and passed down in what is known as a dominant trait. Our parents each give us one version of the gene involved in this trait. The two versions are not equal: ‘dominant’ means that the inheritance of just one copy of the cleft version will give you a chin cleft of some description.
It is less likely, but not impossible, to inherit no cleft versions of the gene and still have a cleft chin. What you pass on to each of your children will be another shuffle of the versions, so that, in turn, they may or may not show the cleft.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.