noun, noun which may take the genitive case particle 'no'
haploidy
Technical term in genetics referring to the state of having a single set of unpaired chromosomes. Used in scientific contexts.
Haploid cells have half the number of chromosomes of normal somatic cells.
The haploid generation in plants is called the gametophyte.
半数体 (haploid) refers to an organism or cell with a single set of chromosomes, while 半数性 is the abstract property of being haploid.
Compound of 半数 (half number) and 性 (nature, property), likely a calque from English 'haploidy' or German 'Haploidie'.