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Related to Dizygotic twins: fraternal twins, Monozygotic twins
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Examining differences in the levels and activity states of these components within pairs of monozygotic and dizygotic twins, the Stanford scientists found that in three-quarters of the measurements, nonheritable influences -- such as previous microbial or toxic exposures, vaccinations, diet and dental hygiene -- trumped heritable ones when it came to accounting for differences within a pair of twins.
When ultrasonography reveals the absence of a "twin-peak sign" indicating a monochorionic placenta, the twins are most likely monozygotic; however, a dichorionic diamniotic (DCDA) [4] placenta--as evidenced by the presence of a twin-peak sign and the same sex for both fetuses--is observed in at least 40% of all twin pregnancies and is compatible with both monozygotic and dizygotic twins.
Preferential use of the upper limb is important in genetic theories of asymmetry, because of the distinction between monozygotic twins, which are actually genetically identical, and dizygotic twins, who share on average 50% of genes.
A genetic and environmental analysis of the vocational interests of monozygotic and dizygotic twins reared apart.
The genotype of dizygotic twins of the same gender is 50% identical.
Twin studies are conducted with equal numbers of both monozygotic and dizygotic twins.
Our study provides evidence that the rate of concordance in dizygotic twins may have been seriously underestimated in previous studies, and the influence of genetic factors on the susceptibility to develop autism overestimated.
In monozygotic twins, only one placenta is present; consequently, the risk of death of one twin is higher than in dizygotic twins, where two placentas are present.
The risk of disease in siblings of RA patients compared with that of the general population (Xs) is estimated as 2-17 and the concordance rates for monozygotic twins versus dizygotic twins range between 15% and 3.
In fact, they found coronary flow rate was significantly lower in dizygotic twins with a history of major depression compared to their fraternal twins without major depression, but there was no significant flow rate difference between monozygotic twins discordant for the disorder.
The investigation involved more than 4,000 monozygotic and dizygotic twins, aged 22-27 years (average age 25), who were enrolled in a population-based longitudinal twin study.