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Chromosome 18 includes 18p-, 18q-, Ring 18, Tetrasomy 18p, and Trisomy 18. 18p can cause heart defects and holoprosencephaly, a [...]

Tetrasomy 18p occurs when there is an extra chromosome made of material from the short arm of chromosome 18. Tetrasomy [...]

Trisomy 13, also known as Patau Syndrome, occurs when there is an extra copy of chromosome 13.

Trisomy 18, also known as Edward Syndrome, occurs when there is an extra copy of chromosome 18. Trisomy 18 can [...]