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Zygosity refers to the genetic makeup of the pregnancy, or the number of zygotes that become fertilized leading to a multiple birth. Twins, in rarer cases triplets, quadruplets (four), quintuplets (five), arising from a single fertilized ovum are termed monozygotic (MZ).
10 lip 2024 · Monozygotic (MZ) twins are believed to arise from the fission of a single fertilized embryo at different stages. Monochorionic MZ twins, who share one chorion, originate from the splitting of the inner cell mass (ICM) within a single blastocyst.
1 sty 2020 · If two genetically distinct populations of cells were formed before repulsion, another distinct cellular differentiation event would have to occur in at least one of the resultant cell populations at the same embryological state in order to produce monozygotic triplets.
The enhanced potential of the zygote to produce monochorionic twins — to about 5.6% of the cases — after blastocyst compared with cleavage stage trans-fers has been suspected to be the result of extended in vitro culture (Behr et al., 2000; Milki et al., 2003).
7 sty 2021 · Here we show that monozygotic twins differ on average by 5.2 early developmental mutations and that approximately 15% of monozygotic twins have a substantial number of these early developmental...
28 wrz 2021 · Monozygotic (MZ) twin births arise when the progeny of a single fertilized egg cell, the zygote, divides into two or more embryos early in development. Why and how often this happens is a long...
14 paź 2021 · Monozygotic (also known as ‘identical’) twins arise when a fertilized egg splits in two before implantation — but the mechanisms that control this have been elusive, and it is widely thought to...
