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A Tetrasomy is a kind of aneuploidy that implicates an extra chromosome pair as a result of the presence of four copies of a specific chromosome, in an otherwise diploid cell. (Tetrasomic Chromosome Formula 2N + 2) [1][2].

Tetrasomy occurs due to nondisjunction in meiosis when both parents produce a gamete each that presents two copies of an individual chromosome, while all other chromosomes in the set present only one copy. The result is a fetus that contains 48 chromosomes, instead of the common 46 chromosomes [3].

Examples of tetrasomies abnormalities for autosomes and for sex chromosomes found in humans:

Sex-chromosome tetrasomies: [4]

Autosomal tetrasomies[6]


  1. http://ghr.nlm.nih.gov/glossary=tetrasomy
  2. Genetics, Rusell (Fifth Edition), Peter J. Rusell). P (207-209)
  3. Genetics, Rusell (Fifth Edition), Peter J. Rusell). P (207-209)
  4. https://en.wikipedia.org/wiki/Tetrasomy
  5. https://en.wikipedia.org/wiki/Klinefelter_syndrome
  6. https://en.wikipedia.org/wiki/Tetrasomy
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