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Adult idential twins in society
The number of twins in the U. According to a report by the National Center for Health Statistics , their birthrate rose 76 percent from to This could be due to the fact that more women over the age of 30 are having children and more are using fertility drugs and assisted reproductive technology, both of which increase the likelihood of multiple gestation. As many as one in three women who use fertility treatments may become pregnant with twins. The result? As many as one in 30 babies born in the United States is now a twin.
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Childhood Infections and Adult Height in Monozygotic Twin Pairs
Twin study - Wikipedia
Twins are two offspring produced by the same pregnancy. In contrast, a fetus that develops alone in the womb is called a singleton , and the general term for one offspring of a multiple birth is multiple. The Yoruba peoples have the highest rate of twinning in the world, at 45—50 twin sets or 90— twins per 1, live births,    possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side. In Central Africa , there are 18—30 twin sets or 36—60 twins per 1, live births. North America and Europe have intermediate rates of 9 to 16 twin sets per 1, live births.
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The Adult Netherlands Twin Register: Twenty-Five Years of Survey and Biological Data Collection
Adult height is determined by genetics and childhood nutrition, but childhood infections may also play a role. Monozygotic twins are genetically matched and offer an advantage when identifying environmental determinants. In —, we examined the association of childhood infections with adult height in height-discordant monozygotic twin pairs from the California Twin Program. To obtain information on childhood infections and growth, we interviewed the mothers of monozygotic twins who differed in self-reported adult height by at least 1-inch 2. Within-pair differences in the relative frequency of childhood infections were highly correlated, especially within age groups.
Twin studies are studies conducted on identical or fraternal twins. They aim to reveal the importance of environmental and genetic influences for traits, phenotypes , and disorders. Twin research is considered a key tool in behavioral genetics and in content fields, from biology to psychology.