| 1. | All reported cases of tetrasomy 18p have some degree of intellectual disability.
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| 2. | The tetrasomy can also be formed independently of cell division.
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| 3. | Cardiac anomalies are the most common congenital malformation in individuals with tetrasomy 18p.
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| 4. | In partial tetrasomy, the karyotype appears normal except for the marker chromosome.
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| 5. | It is also suggested that U-type exchange during meiosis I may lead to partial tetrasomy.
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| 6. | In some cases, segregation of these chromosomes result in partial trisomy, and at other times, a partial tetrasomy.
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| 7. | Tetrasomy 18p is caused by the presence of an additional isochromosome composed of two copies of the p arm of chromosome 18.
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| 8. | Samantha Martin was born with Tetrasomy 18p, a rare chromosome syndrome, resulting in global developmental delays, Autism and a Seizure disorder.
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| 9. | In terms of internal organ systems, tetrasomy X patients may have abnormal vision, hearing, circulatory systems, kidneys, or nervous systems.
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| 10. | "' Cat Eye Syndrome / Schmid Fraccaro Syndrome "'is a condition caused by a partial trisomy or tetrasomy in chromosome 22.
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