Monoploidy

Definition
noun
(genetics) The state of being monoploid, that is having one set of the chromosomes
Supplement
Ploidy refers to the number of sets of homologous chromosomes in the genome of a cell or an organism. Each set is designated by n. Thus, the state of having a single set of chromosomes is referred to as monoploidy and is represented by 1n. The cell or organism with one set of the chromosomes is called a monoploid. In most animals, a monoploidy instead of a diploidy is lethal. This condition may be tolerated more in plant species and therefore they may survive despite the condition. However, in most animal species this could mean death. Nevertheless, there are few animal species where monoploidy is a normal part of the life cycle such as in male wasps, ants, and bees. The offspring that arise from monoploidy are those that have developed from unfertilized eggs.¹
Word origin: mono- (one)
Symbol: 1n
Compare:

• haploidy
• polyploidy
• diploidy

See also:

chromosomes

ploidy

fertilization

somatic cell

sex cell

Related forms:

• monoploid (adjective and noun)

Reference(s):

¹Russell, P., Hertz, P. & McMillan, B. (2013). Biology The Dynamic Science (Units 1 & 2. City: Brooks/Cole Pub Co. p.275