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zygosity
This term is a specialized biological descriptor used primarily in genetics and embryology to categorize the origin of multiple births. It distinguishes between monozygotic twins, who originate from a single fertilized egg, and dizygotic twins, who originate from separate eggs. The word carries a clinical, objective tone and is rarely used outside of medical or scientific discourse.
As an abstract noun denoting a biological state or property, zygosity is uncountable. It describes a quality of a pairing rather than a discrete object that can be counted. Consequently, it does not have a plural form and requires partitive constructions if one needs to refer to specific instances of the property across different sets of twins.
Meanings
Examples
The researchers are studying the zygosity of the twins to determine if they are identical.
DNA testing is the most reliable method for confirming zygosity.
I wonder about their zygosity since they look nothing alike.
The study focused on how zygosity affects the development of certain genetic diseases.
We need to establish the zygosity of the pair before proceeding with the clinical trial.
The doctor explained that zygosity refers to whether twins come from one or two eggs.
Their zygosity was confirmed as monozygotic through a blood test.
Is it possible to determine zygosity just by looking at the infants?