Definition of "tetrasomy"

The representative of TcIII DTU, 231, has tetrasomy of chromosome 10; chromosomes 11 and 18 range from trisomic to tetrasomic; trisomy of chromosomes 6 and 19; and chromosomes 1, 13, 16, 21, 24 and 31 have a ploidy ranging from disomic to trisomic (Fig. 3).

2015 July 4, João Luís Reis-Cunha et al., “Chromosomal copy number variation reveals differential levels of genomic plasticity in distinct Trypanosoma cruzi strains”, in BMC Genomics‎, volume 16