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Related to Dizygotic twins: fraternal twins, Monozygotic twins
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Irritable bowel syndrome (IBS) was reported by 117 pairs of monozygotic twins and 164 pairs of dizygotic twins on questionnaires completed by 6,060 twin pairs living in Virginia.
The sequential cohort study included data from 749 monozygotic twin pairs and 687 dizygotic twin pairs between the age of 8 and 17 and their parents.
Furthermore, the concordance rate was higher in dizygotic twins than non-twin siblings.
Genetic effects on baseline values of C-reactive protein and serum amyloid A protein: a comparison of monozygotic and dizygotic twins.
The results showed no difference in concordance rates for PD in monozygotic and dizygotic twins 60 or more years of age.
Heterogenous patho-mechanisms such as different genetic growth potential in dizygotic twins, placental insufficiency in one twin and as hypothesised by Chamberlain (2001), Twin-Twin Transfusion Syndrome (TTTS) in monozygotic twins, may all result in size differences between neonates (Sonntag et al.
The low concordance rate among monozygotic and dizygotic twins, as well as the similar prevalence in twins and in the general population, "supports the hypothesis that nonhereditary factors are important in the cause of Parkinson's disease," the researchers concluded.
The genetics of psoriasis are complex and the disease is highly heritable as evidenced by an increased rate of concordance in monozygotic twins over dizygotic twins (35%-72% vs.
In dizygotic twins (derived from two separately fertilized eggs), 7.
Host genetic factors play a major role in determining the outcome of mycobacterial infections in humans, as shown by racial variation in susceptibility to infection and higher concordance of tuberculosis and leprosy among monozygotic twins compared with dizygotic twins and siblings (50,51).
However, twin studies have consistently shown low rates of concordance (5-8%) in monozygotic and dizygotic twins (Foltynie et al.
There are two kinds of twins--monozygotic twins, who are identical, and dizygotic twins, who are nonidentical and are no more alike than brother or sister.