The state or condition of an organism or cell containing a single set of chromosomes, usually represented as n.
From haploid + -y suffix. Emerged in 20th-century genetics to name the condition (as opposed to diploidy, which has two sets). Parallel formation to 'diploid/diploidy'.
The chromosome number system (n, 2n, 3n...) is one of biology's most elegant notations—'haploidy' is just 'n,' making human gametes haploid (n=23) while our body cells are diploid (2n=46)!
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