(Noun) The state of having more than two sets of chromosomes in a plant’s cells. In daylilies, a single set has 11 chromosomes, which can be abbreviated as “n”. The ploidy number is given by a number followed by “n”. The names of the ploidy numbers are given Greek numeric prefixes:

Triploidy 3n=33 (Adjective: triploid)

Tetraploidy 4n = 44 (Adjective: tetraploid)

Pentaploidy 5n = 55 (Adjective: pentaploid)

Hexaploidy 6n = 66 and so on 

Also see: ploidy, polyploid, diploid, haploid, triploid, tetraploid, aneuploid, chromosome


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