The state of having a complete, balanced set of chromosomes in whole number multiples, which is normal and healthy.
From Greek eu- (good, well) + -ploid (set of chromosomes) + -y (noun suffix). The term was developed in early 20th-century genetics.
Euploidy is the genetic goldilocks zone—too many or too few chromosomes usually causes problems, but having exact multiples of complete sets often works perfectly, especially in plants.
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