1. All reported cases of tetrasomy 18p have some degree of intellectual disability. 2. The tetrasomy can also be formed independently of cell division. 3. Cardiac anomalies are the most common congenital malformation in individuals with tetrasomy 18p. 4. In partial tetrasomy , the karyotype appears normal except for the marker chromosome. 5. It is also suggested that U-type exchange during meiosis I may lead to partial tetrasomy . 6. In some cases, segregation of these chromosomes result in partial trisomy, and at other times, a partial tetrasomy . 7. Tetrasomy 18p is caused by the presence of an additional isochromosome composed of two copies of the p arm of chromosome 18.8. Samantha Martin was born with Tetrasomy 18p, a rare chromosome syndrome, resulting in global developmental delays, Autism and a Seizure disorder. 9. In terms of internal organ systems, tetrasomy X patients may have abnormal vision, hearing, circulatory systems, kidneys, or nervous systems. 10. "' Cat Eye Syndrome / Schmid Fraccaro Syndrome "'is a condition caused by a partial trisomy or tetrasomy in chromosome 22.
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