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monozygotic

   Also found in: Dictionary/thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
monozygotic /mono·zy·got·ic/ (mon″o-zi-got´ik) pertaining to or derived from a single zygote; as monozygotic twins.
mon·o·zy·got·ic (mn-z-gtk)
adj.
Derived from a single fertilized ovum or embryonic cell mass. Used especially of identical twins.
monozygotic (MZ)
[-zīgō′tik]
Etymology: Gk, monos + zygon, yoke
pertaining to or developed from a single fertilized ovum, or zygote, such as occurs in identical twins. Compare dizygotic. monozygosity, n., monozygous, adj.
monozygotic [mon″o-zi-got´ik; mon″o-zi´gus] (monozygous) pertaining to or derived from a single zygote (fertilized ovum); said of twins. See also dizygotic.
A, Monozygotic twinning. The single inner cell mass divides into two inner cell masses during the blastocyst stage. These twins have a single placenta and chorion, but each twin develops in its own amnion. B, Dizygotic twinning. Two ova are released during ovulation, and each is fertilized by a separate spermatozoon. The ova may implant near each other in the uterus, or they may be far apart. From McKinney et al., 2000.
monozygotic
pertaining to or derived from a single zygote (fertilized ovum); said of twins.
monozygotic twins
see monozygotic twins.
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The twin study design specifically allows for the teasing apart of genetic and environmental influences by mathematically calculating differences between monozygotic twin pairs (who share 100% of their genetic code) and dyzygotic twin pairs (who share an estimated 50% of their genetic code).
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The study included data from 1,797 twins, including 634 twin pairs (437 monozygotic, 150 dizygotic and 47 indeterminate pairs) and 529 individual twins with a mean age of 36.
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