Adult dizygotic twins

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Twins - identical and fraternal

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Twins - identical and fraternal - Better Health Channel

The majority of twins are fraternal twins twins that are more like siblings born at the same time. Learn more about fraternal twinning, from how they form to how they relate to each other, as well as how they differ from identical twins. Fraternal twins form in the same way that all humans do, by the union of sperm and egg. Dizygotic twinning occurs when more than one egg is released during ovulation. This is known as hyperovulation. None of these factors have been proven to increase the chances of having identical twins. A tendency toward hyperovulation can be a genetic trait.
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What Are Fraternal Twins?

Twins are two offspring produced by the same pregnancy. In contrast, a fetus that develops alone in the womb the much more common case, in humans is called a singleton , and the general term for one offspring of a multiple birth is a multiple. North America and Europe have intermediate rates of 9 to 16 twin sets per 1, live births. Multiple pregnancies are much less likely to carry to full term than single births, with twin pregnancies lasting on average 37 weeks, three weeks less than full term.
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Intraclass correlations were calculated by use of analysis of variance. Model-fitting analyses were performed to quantify the genetic and environmental components of the variance for nevus and freckle counts. Quantitative genetic analyses showed that the contribution of genetic factors on nevi expression varied according to age. Body site was also found to affect the heritability estimates for nevus counts, with a statistically significant difference between sun-exposed and sun-protected sites.
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