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Wikipedia About Twins

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Definitions

The general term for more than one offspring in the same pregnancy (multiple birth) is multiples; a fetus which develops alone in the womb is called a singleton.

Statistics

The number of living human twins in the world has been estimated to be approximately 125 million in 2006 (roughly 1.9% of the world population), with just 10 million monozygotic twins (roughly 0.2% of the world population and 8% of all twins). The twin birth rate in the United States in 2004, 2005 and 2006 was slightly above 32 twin live births per 1,000 live births.

Due to the limited size of the mother's womb, multiple pregnancies are much less likely to carry to full term than singleton births, with twin pregnancies lasting only 37 weeks (3 weeks less than full term) on average. Since premature births can have health consequences for the babies, twin births are often handled with special precautions.

The Yoruba, a large west African ethnic group, have the highest rate of twinning in the world, at 45 twins per 1,000 live births. Some researchers have claimed this may be because of high consumption of a specific type of yam, Dioscorea rotundata or white yam containing a natural hormone phytoestrogen which may stimulate the ovaries to release an egg from each side.

Types of twins

There are five common variations of twinning. The three most common variations are all dizygotic:

  • Male–female twins are the most common result, 50 percent of DZ twins and the most common grouping of twins.
  • Female DZ twins (sometimes called sororal twins)
  • Male DZ twins

The other two variations are monozygotic twins:

  • Female MZ twins
  • Male MZ twins (least common)

Among non-twin births, male singletons are slightly (about five percent) more common than female singletons. There are also the mirror image variations: this is where the twins develop reverse asymmetric features. About 25% of monozygotic twins are mirror image twins. The rates for singletons vary slightly by country. For example, the sex ratio of birth in the US is 1.05 males/female, while it is 1.07 males/female in Italy. However, males are also more susceptible than females to death in utero, and since the death rate in utero is higher for twins, it leads to female twins being more common than male twins.

Another variety of twins, "polar body twins," is a phenomenon that was hypothesized to occur and may recently have been proven, very rarely, to exist. This would occur when a portion of a mature egg separates from itself. This is known as the first polar body, and it carries all the same genetic information as the egg. If polar body twins are fact, they would occur when two sperm fertilize both the egg and the first polar body. Generally the first polar body disintegrates. Polar body twinning would result in "half-identical" twins.

Search results for Twins

Twin - Wikipedia, the free encyclopedia

Twins are two offspring resulting from the same pregnancy, either of the same or ... Twins can either be monozygotic (MZ, colloquially, "identical") or dizygotic (DZ, ...en.wikipedia.org/wiki/Twins

Minnesota Twins Team Page - MLB - SI.com

Minnesota Twins news, scores, photos, blogs, stats, injuries, transactions, schedule tickets as well as truth and rumors and Fantasy news from around the web at SI.com.sportsillustrated.cnn.com/baseball/mlb/teams/twins/

Minnesota Twins - CBS Sports.com

News, schedule, rosters, and more.www.sportsline.com/mlb/teams/page/MIN

FOX Sports on MSN - MLB - Minnesota Twins Team Front

Minnesota Twins Baseball, tickets, schedule, pictures, news, rumors, trade, videos, stats, score, photos and more for Minnesota Twinsmsn.foxsports.com/mlb/team?statsId=9

Minnesota Twins - Wikipedia

Hyperlinked history of the American League team.en.wikipedia.org/wiki/Minnesota_Twins

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News about Twins

Charley Walters: Minnesota Twins badly missed Joe Mauer

Denver PostThe Twins are 11-11 without Joe Mauer this season. It's safe to say that, had the all-star catcher and batting champion been in their lineup, it would have been worth at least a couple more victories. That would have Minnesota leading its division rather than in fourth place.http://www.denverpost.com/breakingnews/ci_12259076?source=rs...

Bedard attempts to solve Twins

Seattle MarinersBedard attempts to solve Twinshttp://mlb.mlb.com/news/article.jsp?ymd=20090509&content_id=...

Twins hit 4 homers, blank Mariners 11-0

AP via Yahoo! NewsScott Baker pitched seven shutout innings for his long-awaited first victory of the season, and the light-hitting Twins broke the game open with three homers in the fifth inning of an 11-0 win over the Seattle Mariners on Friday night.http://news.yahoo.com/s/ap/20090509/ap_on_sp_ba_ga_su/bba_ma...

Shooter Now: Minnesota Twins would be in first place with Joe Mauer

Denver PostThe Minnesota Twins are 10-11 without Joe Mauer this season. It's safe to say, had the all-star catcher and batting champion been in their lineup, it would have been worth at least a couple more victories, and that would have Minnesota leading its division rather than in fourth.http://www.denverpost.com/breakingnews/ci_12253527?source=rs...

Mauer and Morneau go deep to lead Twins past M's

FOX 16 Little RockJoe Mauer and Justin Morneau clubbed back- to-back homers for the second consecutive night, as the Twins used another strong offensive showing to beat Seattle, 9-6, sending the Mariners to...http://www.fox16.com/content/sports/story/Mauer-and-Morneau-...

News about Twins

HR-mad Twins trip M's

CNN Sports IllustratedHernandez (4-2) gave up six runs - five earned - and six hits in four innings for the Mariners, who have lost six in a row. After they both went deep in the fifth inning of an 11-0 win on Friday night, the Twins' version of M&M Boys did it again ... http://sportsillustrated.cnn.com/baseball/mlb/gameflash/2009...

Mauer and Morneau go back-to-back again in Twins' 9-6 win over Seattle

Baltimore SunSeattle Mariners pitcher Chris Jakubaauskas adjust his cap after giving up a three-run home run to Minnesota Twins' Brendna Harris in the second inning of a baseball game Friday, May 8, 2009 in Minneapolis. (AP Photo/Jim Mone) (Jim Mone, AP / May 8 ... http://www.baltimoresun.com/sports/nationworld/wire/sns-ap-b...

With twins or more, moms keep busy

Berkshire EagleFor some who celebrate Mother's Day today, doing two things at once is second nature — two feedings, two changings, two baths, two good-night kisses. In the world of twins and multiples, nothing happens once. Sharon and Matthew Billeter of Dalton ... http://www.berkshireeagle.com/ci_12337127

No need to split twins: mom

Chicago Sun-TimesPalos Hills resident Shari Schmidt is trying to get Illinois to pass a Twins Law. Already adopted in 10 other states, the law would require public schools to consult with parents before deciding to place twins in separate classrooms. Separating twins ... http://www.suntimes.com/news/metro/1566176,CST-NWS-twins10.a...

Famous celestial twins many light years apart

Everett HeraldTake a gander at the constellation Gemini, also known as the Twins, soon because in about a month what's left of the winter constellations will be gone from the evening skies. This is all part of the annual dance of all constellations as they shift ... http://www.heraldnet.com/article/20090510/LIVING/705109980

Search results for Twins

Minnesota Twins - Wikipedia, the free encyclopedia

The Minnesota Twins are a professional baseball team based in Minneapolis, Minnesota, USA. The Twins are a member of the Central Division of Major League Baseball 's American ... http://en.wikipedia.org/wiki/Mn_twins

Twins definition | Dictionary.com

Copy & paste this link to your blog or website to reference this pagehttp://dictionary.reference.com/browse/Twins

Twins definition of Twins in the Free Online Encyclopedia.

twins: see multiple birth multiple birth, bringing forth of more than one offspring at birth. Although many smaller mammals bear several young at a time, multiple births are ... http://encyclopedia2.thefreedictionary.com/twins

Twins Jazz & Twins Lounge

Intimate U Street jazz supper club featuring top local and national talent. Online ticketing.http://twinsjazz.com/

Twins (1988/I)

advertisement. Overview. User Rating: 5.9/10 29,353 votes. MOVIEmeter: Up 4% in popularity this week. See why on IMDbPro. Director: Ivan Reitman. Writers : William Davies (written ... http://www.imdb.com/title/tt0096320/

Wikipedia results for Twins

Twin - Wikipedia, the free encyclopedia

Twins are two offspring resulting from the same pregnancy, usually born in close succession. They can be the same or different sex. Twins can either be monozygotic (MZ ... http://en.wikipedia.org/wiki/Twin

Minnesota Twins - Wikipedia, the free encyclopedia

The Minnesota Twins are a professional baseball team based in Minneapolis, Minnesota, USA. The Twins are a member of the Central Division of Major League Baseball 's American ... http://en.wikipedia.org/wiki/Mn_twins

Twins (group) - Wikipedia, the free encyclopedia

Twins was a Hong Kong-based female Cantopop duo created in the summer of 2001 by Emperor Entertainment Group (EEG). Twins was made up of two girls, Charlene Choi Cheuk-Yin and ... http://en.wikipedia.org/wiki/Twins_%28group%29

Twins (1988 film) - Wikipedia, the free encyclopedia

Twins is a 1988 comedy film produced and directed by Ivan Reitman about unlikely twins (played by Arnold Schwarzenegger and Danny DeVito) who were separated at birth.http://en.wikipedia.org/wiki/Twins_(1988_movie)

Twins (film) - Wikipedia, the free encyclopedia

Twins (film) may refer to: Twins, a 1925 film starring Stan Laurel; Twins, a 1988 comedy film starring Arnold Schwarzenegger and Danny DeVito; Twins, gay pornographic film starring ... http://en.wikipedia.org/wiki/Twins_(film)
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Videos found for Twins

Twins born to 60 year old

Twins born to 60 year oldThe birth of twins by a 60-year-old Calgary woman has raised many ethical questions. CBC's Cameron Macintosh reports.Windows Media - Video

Brad and Angelina Show Off the Twin...

Brad and Angelina Show Off the TwinsCheck out the rare sighting of the entire Brangelina brood, including 6-month-old twins Knox and Vivienne!Flash - Video

Hot Stove: Minnesota Twins

Hot Stove: Minnesota TwinsBuster Olney looks at the Minnesota TwinsFlash - Video

Operator helps dad deliver twins at...

Operator helps dad deliver twins at homeJan. 25: A 911 operator talks a new dad through delivering twins when his wife went into early labor. (MSNBC)Windows Media - Video

Bush twins to Obama girls: 'It isn'...

Bush twins to Obama girls: 'It isn't always easy'Jan. 23: The Bush twins pass on the wisdom they gleaned from living in the White House, urging Sasha and Malia Obama to always "remember who your dad really is." NBC's Brian...Windows Media - Video

Answers for Twins

KCTwins....???????KCBelieve it or not, I am (or was?) a Mo-Mo twin. My mother gave birth to me and my brother vaginally and yes she was hospitalized for monitoring towards the very end of the pregnancy. She delivered us ...DeAnnaWhat are the odds of having twins or more without fertility assistance?DeAnna30 of 1,000 births is the odds. If the women in your family ovulate 2 or more eggs at a time it can be as high as 35%. If you are over weight you have better chances as well.DonnieWhat is the possibility of having twins if both parents are twins?DonnieThat depends. Is your wife a fraternal or identical twin? (Identicals are purely by chance and will not influence your ability to have twins!) Being a female fraternal twin increases the chance of ...alias060700What are my odds of having fraternal twins if my great-great grandmother had two sets?alias060700As far as this issue goes, I wouldn't think your family history matters much that far back. Fraternal twins happens when you release more than one egg during a single ovulation cycle and two eggs get...The Road goes ever onWhat is the likelihood that identical twins will not have the same handedness?The Road goes ever onThe likelyhood of left-handedness doesn't really change for fraternal twins, but with identical twins there is a big influencer on handedness that is solely to do with being an identical twin. Ther...
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