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In contrast, discordance occurs when a similar trait is not shared by the persons. Studies of twins have shown that genetic traits of monozygotic twins are fully concordant, whereas in dizygotic twins, half of genetic traits are concordant, while the other half are discordant. Discordant rates that are higher than concordant rates express the ...
If one twin dies in utero, blood accumulates in that twin's body, causing exsanguination of the remaining twin. [2] In the case of monoamniotic twins the risk of complications is substantially higher because of additional potential umbilical cord entanglement and compression. [3] However, the perinatal mortality of monochorionic twins is fairly ...
Twin-to-twin transfusion syndrome (TTTS), also known as feto-fetal transfusion syndrome (FFTS), twin oligohydramnios-polyhydramnios sequence (TOPS) and stuck twin syndrome, is a complication of monochorionic multiple pregnancies (the most common form of identical twin pregnancy) in which there is disproportionate blood supply between the fetuses.
However, when comparing the frequency of discordant pairs of handedness, pairs that exhibit opposite handwriting, there was little to no difference in frequency. The frequency of left-handedness in monozygotic dichorionic twins was 22% and the data of frequencies of left-handedness in monozygotic monochorionic twins was 23%. [2]
Cytonuclear discordance describes the discrepancy in phylogenetic relationships using mitochondrial DNA (mtDNA) versus nuclear genes (or nuclear DNA, nDNA). In other words, mitochondrial and nuclear gene sequences may lead to different, if not contradictory, phylogenetic trees that show the relationships among species .
Multiple births (twins, triplets and higher multiples) count as one pregnancy (gravidity) and as one birth. For example, a pregnant female who carried one pregnancy to term with a surviving infant; carried one pregnancy to 35 weeks with surviving twins; carried one pregnancy to 9 weeks as an ectopic (tubal) pregnancy; and has three living ...
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However, some pregnancies with CPM experience prenatal or perinatal complications. The pregnancy loss rate in pregnancies with confined placental mosaicism, diagnosed by chorionic villus sampling, is higher than among pregnancies without placental mosaicism.