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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).
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...
The second hypothesis maintains that an intrinsic propensity for embryonic splitting always exists as part of the so-called co-dominant axis theory of monozygotic twinning (Boklage, 2005). Under normal circumstances, one axis (out of more than one embry-onic ‘streak’) dominates and suppresses the other(s).
The processes that give rise to monozygotic (MZ) twins remain elusive. This article describes various theories of MZ twinning that have been examined over the years, although they continue to be speculative.
birth. Twins, in rarer cases triplets, quadru-plets (four), quintuplets (ve), arising from a single fertilized ovum are termed mono-zygotic (MZ). The rst identical quintuplets known to have survived their infancy were the Canadian Dionne quintuplets, all ve of which survived to adulthood (. Fig. 3.1).
13 sty 2021 · Looking at 381 monozygotic twin pairs and 2 triplets, the authors first estimated the number of postzygotic mutations present in one twin but not the other.
ABSTRACT Monozygotic twinning is rare within popula-tions yet taxonomically widespread. We explore the evolution of monozygotic twinning by modeling an allele in a newly formed offspring that causes it to undergo mitosis and sepa-ration to form one or more clones (twins), potentially in conflict with the parents' best interest.
