tetrasomicadj.n.

1922 A. F. Blakeslee in Amer. Naturalist 56 19 I have suggested..the terms disome [etc.]..with the adjectives disomic, trisomic, tetrasomic.

1923 Bot. Gaz. 76 345 Since in the somatic cells of a tetraploid Datura each of the 12 chromosomal sets consists of 4 homologous chromosomes instead of only 2 as in diploids, it is obvious that in dealing with the transmission of Mendelian characters we have to do with tetrasomic rather than with the disomic inheritance more familiar to students of heredity.

1937 C. D. Darlington Rec. Adv. in Cytol. (ed. 2) 325 Tetrasomics (whether of fragments or whole chromosomes) are more markedly abnormal..than the corresponding trisomics.

1946 Nature 21 Sept. 418/1 Lucerne.., having also given segregation ratios which can best be interpreted as tetrasomic, may be regarded as an autotetraploid.

1961 Lancet 7 Oct. 789/1 His father was in effect tetrasomic for that chromosome.

1974 Nature 19 Apr. 714/3 The book is then divided into two main parts, the first dealing with trisomics, with some mention of tetrasomics, and the second dealing mainly with monosomics but also mentioning nullisomics.

1961 Lancet 23 Sept. 724/1 Monosomy, trisomy, or even tetrasomy have very little functional effect.

1977 H. Zellweger & J. Simpson Chromosomes of Man p. xii Trisomy = 46 + 1 chromosome. Tetrasomy = 46 + 2 chromosomes of the same type.