A trisomy is a type of polysomy in which there are three instances of a particular chromosome, instead of the normal two. A trisomy is a type of aneuploidy.
Triploidy is the term referring the presence of three sets of haploid (single) chromosomes in an organism or cell line and is termed 3n, where 1n is the haploid chromosome number for the species concerned. Triploids are both euploid and polyploid in that they contain a completely balanced extra set of chromosomes to the normal diploid (2n) state. Triploids are rarely found in a viable state in wild animal populations but can occur in plant communities. Triploids are widely used in both commercial fruit, fish, and mollusk production as they can have beneficial commercial traits such as improved growth, pathogen resistance, and infertility conferring protection of elite genetics.
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