Definition of tetraploid in US English:



  • 1(of a cell or nucleus) containing four homologous sets of chromosomes.

    • ‘To test their model I constructed and tested triploid and tetraploid cells, which, contrary to their model that predicted that they should be more resistant, became progressively more sensitive.’
    • ‘Recent molecular data indicate differences in molecular chromosome organization among the genomes of diploid, tetraploid, and hexaploid wheat.’
    • ‘Compared to their diploid counterparts, which have a normal set of chromosomes, tetraploid cells were more prone to generate tumors in mice, and these tumors showed genomic instability similar to many human cancers.’
    • ‘Our studies on isogenic diploid and tetraploid cells show that tetraploids have increased chromosome instability during exponential growth.’
    • ‘Abnormal diploid, triploid and tetraploid nuclei with separated dual color signals were clearly distinguishable from normal nuclei.’
    1. 1.1 (of an organism or species) composed of tetraploid cells.
      • ‘The derivation of our model centers on tetraploid species in which multivalent pairing is only one mechanism for chromosomal pairings during meioses.’
      • ‘The diploid and hexaploid species are distributed in Asia and Africa, while the tetraploid species inhabit Africa and mainly the Palearctic area including Europe, North Africa, and western Asia.’
      • ‘Modern bread wheat itself is also a fairly recent crop in the evolutionary timescale, having arisen only about 4000 years ago through hybridisation of tetraploid (pasta or durum) wheat with inedible goat grass.’
      • ‘Species with 120 chromosomes are classified as functional diploid species, species with 250 chromosomes as functional tetraploid species, and with 500 chromosomes as functional octaploids.’
      • ‘In terms of economics, the polyploid AD genome is by far the most important as > 90% of the world's cotton fibre is produced by G. hirsutum and G. barbadense, two of the tetraploid species.’


  • A tetraploid organism, variety, or species.

    • ‘In addition, because the evolution of higher-level polyploids is less well understood than that of tetraploids, the study of the O. tuberosa alliance and the origins of oca provides an important case study.’
    • ‘The populations showed continuous morphological variation connecting the species, but karyotypically they consisted of only three types of plants: diploids, triploids, and tetraploids.’
    • ‘Our studies on isogenic diploid and tetraploid cells show that tetraploids have increased chromosome instability during exponential growth.’
    • ‘The results from these studies are generally consistent with theoretical expectations of higher genetic diversity in tetraploids than their diploid progenitors.’
    • ‘Then somewhere - no one knows where - the tetraploids crossed with another species of wild grass to produce the bread wheats from which we make leavened bread today.’