What is the edwards syndrome mode of inheritance?

Sporadic event: The preparation of an egg for fertilization includes reducing all the chromosomes (22 regular pairs + a sex chm pair) from pairs to singles. The sperm then brings a single 1-22 regular +a sex chromosome. If the egg has a pair of 18 chms, then when the sperm adds the single 18 there is 3, this creates the chms imbalance in every skin cell of the fetus & results in the defects of edward syndrome.

Edwards Syndrome: Trisomy 18 - chromosomal condition in 1/5,000 to 6,000 live births due to random events while egg or sperm form.Usually not inherited. 5 to 10% live past 12 months. May have small jaw, mouth & head, low-set ears, short sternum, heart defects, low birth wt, clenched fists, contracted joints, seizures, scoliosis, spina bifida, high BP, cleft palate & lip, hearing loss & mental retardation.