YPES OFEDIARDS Full Trisomy 18: The most common type of Trisomy 78 Occurring in about 95%6 of all cases) is full Trisomy With full Trisomy, the extra chromosome occurs in every cell in the babys body. This type of trisomy is not hereditary. b(72301076020)TypEs of Edward’s • Full Trisomy 18: – The most common type of Trisomy 18 (occurring in about 95% of all cases) is full Trisomy. – With full Trisomy, the extra chromosome occurs in every cell in the baby's body. – This type of trisomy is not hereditary. Dania M. Jacob (12301016020) 6