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Multiple birth - Classification | | Multiple birth - Classification: Encyclopedia II - Multiple birth - Classification | | The most common form of human multiple birth is twins (two babies), but cases of triplets (three), quadruplets (four), quintuplets (five), sextuplets (six), septuplets (seven), and octuplets (eight) have all been recorded with all siblings being born alive. The largest set in which all members survived more than a few days is septuplets, the first of which was in 1997. There have been a few sets of nonuplets (nine) in which a few babies were born alive, and there have been pregnancies — but no known instances of live births — of decaplet ...
See also:Multiple birth, Multiple birth - Classification, Multiple birth - Human multiple births, Multiple birth - Causes and frequency, Multiple birth - Risks, Multiple birth - Cultural aspects, Multiple birth - List of famous multiple births, Multiple birth - Fictional multiple births | | | Multiple birth, Multiple birth - Causes and frequency, Multiple birth - Classification, Multiple birth - Cultural aspects, Multiple birth - Fictional multiple births, Multiple birth - Human multiple births, Multiple birth - List of famous multiple births, Multiple birth - Risks, List of famous trinities, trios, triplets, or threesomes, Twins | | |
| | | Multiple birth: Encyclopedia II - Multiple birth - Classification
Multiple birth - Classification
The most common form of human multiple birth is twins (two babies), but cases of triplets (three), quadruplets (four), quintuplets (five), sextuplets (six), septuplets (seven), and octuplets (eight) have all been recorded with all siblings being born alive. The largest set in which all members survived more than a few days is septuplets, the first of which was in 1997. There have been a few sets of nonuplets (nine) in which a few babies were born alive, and there have been pregnancies — but no known instances of live births — of decaplets (ten), undecaplets (eleven), duodecaplets (twelve), and quindecaplets (fifteen). Most of these are a result of fertility drugs, though a set of duodecaplets was conceived spontaneously (without the aid of fertility treatments) in Argentina in 1992.
There are two types of multiple births, fraternal and identical. Identical siblings arise where one egg is fertilised and the resulting zygote splits into more than one embryo. Identical siblings therefore have the same genetic material. Fraternal siblings result from the fertilisation and implantation of more than one egg, so fraternal siblings are not genetically identical.
Higher orders of multiple births (triplets or higher) may result in a combination of fraternal and identical siblings, and are occasionally given the term of super twins. As an example, a set of quadruplets may consist of two sets of identical twins. For simplicity, we'll say two are male, the other two, female. If the two male children have an identical genetic code, then they are considered identical twins in and of themselves. Likewise for the female children. The males are considered fraternal to the females, but identical to their brother. This isn't limited to just male/female quadruplets, but they statistically make up half of all quadruplet identical super twins. Other cases may involve just one set of identical twins with one or more fraternal siblings.
Other related archives1915, 1934, 1974, 1983, 1985, 1993, 1997, 1998, 2001, Abha, African, Alice in Wonderland, April, May and June, Apu and Manjula Nahasapeemapetilon, Beagle Boys, Beagle Brats, Cambridge University, Canada, Cape Town, Caucasian, Chukwu octuplets, Corbeil, Ontario, Dahm Sisters, Daisy Duck, Des Moines, Iowa, Dilley sextuplets, Dionne quintuplets, Disney, Donald Duck, East Asian, FSH, Hollis, Oklahoma, Houston, Huey, Dewey and Louie, Indianapolis, January 11, January 14, July 12, June 4, Kim Jong-il, Leanna, Lewis Carroll, List of famous trinities, trios, triplets, or threesomes, Liverpool, May 21, May 25, May 28, McCaughey septuplets, Mickey Mouse, Morty and Ferdie Fieldmouse, North Korea, November 11, November 19, Placentalia, Playboy, Raising Arizona, Rosenkowitz sextuplets, Saudi Arabia, Shelbyville, South Africa, Springfield, The Simpsons, Twins, United Kingdom, United States, Washington, DC, egg, fertility drugs, fertility medication, in vitro fertilisation, infertility, insemination, pregnancy, race, selective reduction, twins, zygote
 Adapted from the Wikipedia article "Classification", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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