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Samples in periodicals archive:
MAKE TWO Non-identical or dizygotic twins occur when two fertilized eggs are implanted in the uterus wall at the same time.
Monozygotic ('identical') twins also have a higher rate of congenital abnormalities than singletons or dizygotic ('non-identical') twins (Schinzel et al.
There is a higher concordance rate in monozygotic than dizygotic twins and 50% of children presenting with convulsions may not have any identifiable risk factors.
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.
There is a strong genetic tendency, 75 per cent of monozygotic twins are concordant for the disease, compared to 10 per cent of dizygotic twins; 10 per cent of first degree family relatives of an index patient have celiac disease8.
Thus, although twin study data support a significant role for genetics in the etiology of sexual orientation (concordance rates for dizygotic twins--who share 50% of their genes on average--were 22% for men and 16% for women), they also clearly indicate that factors other than genes are at play.
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.