Most common cause of Down syndrome is
Genetics of Down syndrome 95% cases - Meiotic nondisjunction of chromosome 21 occurring in the ovum 4% cases - Robesonian translocation 1% cases - Mosaicism resulting from mitotic nondisjunction of chr 21
Robesonian translocation
Mosaicism
Meiotic nondisjuction
Epigenetic mutation
General pathology