What Is Downs Syndrome More Condition_symptoms Are Achondroplasia And Down Syndrome More Common In Certain Races?

Are Achondroplasia and Down Syndrome more common in certain races? - what is downs syndrome more condition_symptoms

There are many diseases, disorders, etc., which only a few races / people are more susceptible d 'born / with it, such as sickle cell anemia, osteoporosis ...
I realized that I never met a person with achondroplasia black, Asian or a person with Down syndrome.
Perform one of the most frequently occur, because in racing? If so, why?