In theory, when a nondisjunction for chromosome 18 occurs during meiosis I, four gametes can be produced. If these gametes are fertilized with unaffected gametes from the second parent, what observations would you make concerning the resulting embryos

The resulting embryo will be an individual which has 47 chromosomes. Chromosome number need to be precise or it will drastically alter the development of the embryo. Trisomy 18 is known as de Edward's syndrome. This condition is the second most common type of trisomy after down syndrome and is more common in females. The effect of these genetic disorder can vary among patient and depends on the extent of the extra copy, genetic history and other variables. Most newborn while die during the first days or couple of months.