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Originally Posted by
Giordano57
I've heard that cheek dimples are a genetic mutation passed down like blue eyes but was unsure if this was true or not??
Since I have cheek dimples, your question aroused my curiosity. I found this (rather old) stuff online:
From what I've read, it seems that there are separate cheek and chin dimple genes. One site even placed them on certain chromosomes -- cheek dimples on chromosome 5 and cleft chin on chromosome 16! I couldn't find any corroborating evidence for this anywhere, though.
You are right in that it is easy to see how two Dd parents could have a ddchild; each parent needs to contribute a d gene. The d form of the gene is probably recessive because of a mutation. Often in these dominant-recessive gene pairs, the recessive copy of the gene is mutated so it doesn't work anymore which is why the dominant version wins out.