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twin falls 1.jpgNRT Shinjuku Tokyo - view from twin observation floors on top of the Metropolitan Government Offices Towers known as Tokyo Tocho 01 3008x2000.jpg1989_29_excella_twin_front-med.jpg

Wikipedia about twin

TwinGirls.jpg

Twins are two offspring resulting from the same pregnancy, either of the same or opposite sex.

The general term for more than one offspring from the same pregnancy (multiple birth) is multiples, for example triplets refers to cases of three offspring from the same pregnancy. A fetus alone in the womb is called a singleton.

Twins are usually, not necessarily, born in close succession. 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 on average, 3 weeks less than full term. Since premature births can have health consequences for the babies, twin births are often handled with special precautions.

Twins can either be monozygotic (MZ, colloquially, "identical") or dizygotic (DZ, colloquially, "fraternal"). There are estimated to be approximately 125 million human twins and triplets in the world (roughly 1.9% of the world population), and just 10 million monozygotic twins (roughly 0.2% of the world population and 8% of all twins). The current rate in the United States is 31 twin births per 1,000 women.

The Yoruba, a large west African ethnic group, have the highest rate of twinning in the world at 45 twins per 1000 live births. Some researchers have claimed this may be because of high consumption of a specific type of yam, dioscorera rotundata or white yam containing a natural hormone phytoestrogen which may stimulate the ovaries to produce 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, at about 40 percent of all twins born
  • 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 is 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 itself from the egg. 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 Twin

Twin Creeks Sports Complex

A for-profit park. ... Host Hotels for Reduced Rates through Twin Creeks ... Note: Twin Creeks is a facility of the County of Santa Clara Regional Parks System. ...www.twin-creeks.com/

Twinstuff.com

Guide to resources for twins, including news, articles, events, forums, and products.www.twinstuff.com/

TWIN SIX: Alternative Cycling Apparel

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Twin Cities City Guide - Recommendations and Reviews by Citysearch.com

Find reviews and recommendations about the city of Twin Cities at Citysearch.com. Get information on anything from restaurants to real estate.twincities.citysearch.com/

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News about Twin

Twin girls born

Madison Daily LeaderTwin daughters, Shay Marie, weighing 3 lbs. 5 oz., and Shelby Ann, weighing 3 lbs. 15 oz., were born on Sept. 29 at Sanford Hospital in Sioux Falls to Mark and Susan Poncelet. Grandparents are Jack and Susan Poncelet & Tom and Joyce Farrell, all of Madison.http://www.madisondailyleader.com/site/news.cfm?BRD=1302&dep...

Police in Twin Falls investigate child death

KPAX Missoula Associated Press - October 2, 2008 9:44 AM ET TWIN FALLS, Idaho (AP) - The death of a six-month-old boy this week in Twin Falls has prompted an investigation, as police say there are "a lot of...http://www.montanasnewsstation.com/global/story.asp?s=911181...

Police in Twin Falls investigate child death

The OlympianThe death of a six-month-old boy this week in Twin Falls has prompted an investigation, as police say there are "a lot of question marks."http://www.theolympian.com/northwest/story/604823.html

Doctors may use tissue engineering to grow Nepalese twin Jamuna's skull

Channel NewsAsiaSINGAPORE: Former Nepalese conjoined twin Jamuna Shrestha is back in Singapore, following the death of her sister two months ago. Jamuna and Ganga made medical history in 2001 when they were separated after a five-day operation.http://www.channelnewsasia.com/stories/singaporelocalnews/vi...

USCorp Updates Gold and Silver Mineralization at Twin Peaks Gold Property

Centre Daily TimesUSCorp (OTCBB:USCS) announced today it has received a description of the mineralization trends on its Twin Peaks property in Yavapai County, Arizona.http://www.centredaily.com/business/story/878691.html

News about Twin

Jwala wins twin Bulgarian GP titles

Zee NewsNew Delhi, Oct 12: It was double victory feat for India's Jwala Gutta as she clinched women's doubles as well as mixed doubles titles at the Bulgarian Grand Prix badminton tournament in Sofia on Sunday. Pairing with fellow shuttler V Diju in the ... http://www.zeenews.com/articles.asp?aid=475712&sid=spo&ssid=...

GRAPHIC: How $700 billion stacks up against other government bailouts ...

USA TodayAs a result of the downturn, developed countries are not expected to help 28 countries facing twin shocks of rising food and fuel prices, said the bank's president, Robert Zoellick. "For the poor, the costs of the crisis could be lifelong," he said. ... http://www.usatoday.com/money/economy/2008-10-12-financial-c...

'Chihuahua' fetches $17.5M, remains top movie dog

Seattle Post IntelligencerIn this photo provided by Walt Disney, A chihuahua is served dinner in a scene from the movie, "Beverly Hills Chihuahua." The little dog brought in big audiences this weekend, making "Beverly Hills Chihuahua" the top box office hit. Studio estimates ... http://seattlepi.nwsource.com/movies/1402ap_box_office.html

Paulson: Protectionist policies won't solve crisis

ForbesAs a result of the downturn, developed countries are not expected to help 28 countries facing twin shocks of rising food and fuel prices, said the bank's president, Robert Zoellick. "For the poor, the costs of the crisis could be lifelong," he said. ... http://www.forbes.com/feeds/ap/2008/10/12/ap5540856.html

Gov't mulls plan to take ownership stakes in banks

Guardian UnlimitedThe economic crisis is limiting the ability of the world's richest nations to help countries facing twin shocks of rising food and fuel prices, said bank president Robert Zoellick, a former U.S. diplomat, trade negotiator and business executive. "For ... http://www.guardian.co.uk/world/feedarticle/7859240

Search results for Twin

Twin Farms - All Inclusive Vermont Resort and Spa

Twin Farms - All Inclusive Vermont Resort and Spa ... Zagat 2007 #1 Best Small Hotel in the U.S Best Rooms - Best Servicehttp://www.twinfarms.com/

Twin Valley Telephone and Communications

Twin Valley Communications provides advanced telecommunications services to Barnard, Bennington, Beverly, Greenleaf, Miltonvale, Tescott counties in Kansas.http://www.twinvalley.net/

Twin Visions Photography

Artistic and Creative Photography, weddings, seniors, children, families, commerical and special creationshttp://www.twinvisionsphoto.com/

Twins

Twin.com is a resource site for twins and parents of twins. ... Twin names Deciding what to name your twins can be especially challenging.http://www.twin.com/

Home - Twin Trading

AgroFair UK launch smoothie drink in ASDA/ Lanzamiento del smoothie (licuado de frutas) de AgroFair en ASDA 12/09/08 AgroFair UK is about to launch its first OKÉ branded Fairtrade ... http://www.twin.org.uk/
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Bidding war for Brangelina twin pic...

Bidding war for Brangelina twin picsA bidding war has begun for the first shots of Angelina Jolie and Brad Pitt's twins who are due to be born within weeks.The war between two of the US's biggest magazines is...Flash - Video

Panda Gives Birth To Twin Cubs

Panda Gives Birth To Twin CubsAdventure World Park in Japan shared the video of the cubs, Bill Hudson reports (0:46).Windows Media - Video

BMW Twin Turbo 1 Series

BMW Twin Turbo 1 SeriesThe dynamic new coupé is based on the successful BMW 1 Series and will feature the award-winning Twin Turbo petrol engine, agile rear-wheel drive handling and muscular d...Flash - Video

Danica Patrick wins at Twin Ring Mo...

Danica Patrick wins at Twin Ring MotegiDanica Patrick becomes the first woman to win an IndyCar race. Twin Ring Motegi, 04/19/08. Usually I do not make a habit of swiping copyrighted content from TV (please check out...Flash - Video

Twin Tornadoes At Sea

Twin Tornadoes At SeaLook as these creepy dualing tornadoes follow this boat at sea. Not a place I would want to be.Flash - Video

Videos found for Twin

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klip_zima_byTwin_2004.mpgprasárna Vacka 14.4.2004 (1,9 MB) jak mě málem sestřelil závodník Vacek se svým Subaru (omluvte Járův komentář) klip zima 2003/2004 - made by Twin (19,4 MB) můj zimní videoklip sestříha...mpeg: 19.5 MB w:192px - h:144px

America Under Attack 11 September 2...

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twin.avisome interesting stuff on: http://www.malventano.com/scirocco/twin/cam/ namely: http://www.malventano.com/scirocco/twin/cam/twin.avi (a 4 meg xvid from start to current - compressed very low for thosw...avi: 3.7 MB w:320px - h:240px

20040118-Twin_Cave_1-Cavern.wmv

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Answers for Twin

Irmie

How can I turn a twin bed temporarily into a chaise?

IrmieYou also can purchase pillow roll blanks at the fabric stores in a variety of sizes to use as back cushions. Two of the round long one work on the back of a twin to turn it into a couch. No sewing n...
Need Help

What is a good type of twin tip skis to buy?

Need Helpim in the same sort of position you are but im just as happy to ski the mountain as well as parks and im not intermediate :P (i like to think so anyway). depending on where you live will depend and ho...
Evolution360

Is it possible to have a twin supercharger setup on a car?

Evolution360Yes. But with a stock engine, you run a grave risk of blowing the engine with too much boost. It is better to have the entire motor built with proper internal forged parts, and possibly, depending on ...
tom

What is the cheapest set of twin tips that are actually good?

tomk2 silencers are one of the best and most affordable but if you keep your eye open you can find good deals on k2 public enemies there worth the extra money
Madelyn J

How is the operation for cojoined twin seperation performed?

Madelyn JEvery operation to separate conjoined twins is different. It all depends on what they share. Some twins are joined at the head and share parts of the brain. That would be a completely different op...

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