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Twin - Wikipedia

en.wikipedia.org/wiki/Twin

Monozygotic twins can develop differently, due to different genes being activated. More unusual are "semi-identical twins".

Identical twins - how do the happen, chances and risks of identical ...

www.huggies.com.au/childbirth/multiple-births/twins/identical

What causes identical twins or monozygotic twins? Find out the chances of having identical twins and the risks involved. Huggies.com.au.

www.ask.com/youtube?q=How Are Identical Twins Made?&v=sOBvRhXIJN4
Nov 6, 2013 ... Footage from "National Geographic-In The Womb (Identical Twins) ... GROWS IN THE WOMB DURING PREGNANCY - How TWINS are made?

Twin pregnancy - identical and fraternal twins - single fertilized egg ...

www.baby2see.com/multiples/twins.html

The 'semi-identical' twins are the result of two sperm cells fusing with a single egg , before becoming two embryos. An embryo created this way doesn't usually ...

How are twins formed?

www.vtaide.com/png/George/twins.htm

Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves.

How do twins develop? - The Bump

www.thebump.com/a/how-do-twins-develop

Identical twins develop after your fertilized egg splits in half and creates two genetically identical (aka monozygotic) embryos. If this happens a couple of weeks ...

How are non-identical twins made? | Reference.com

www.reference.com/science/non-identical-twins-made-a07b33173988e856

Nonidentical twins occur when a woman produces two separate eggs that are then fertilized by two different sperm cells. The resulting twins sometimes look ...

How do fraternal twins differ from identical twins? - UCSB Science Line

scienceline.ucsb.edu/getkey.php?key=4016

Now, for identical twins, these happen when a single egg is fertilized by a single sperm and it splits into identical halves - two babies with identical DNA are now ...

Being Pregnant with Twins | SexInfo Online

www.soc.ucsb.edu/sexinfo/article/being-pregnant-twins

There are two types of twins--fraternal and identical--that are formed through separate processes taking place during sexual reproduction. The third type of ...

Study: Identical Twins Caused by 'Embryo Collapse' | Fox News

www.foxnews.com/story/2007/07/05/study-identical-twins-caused-by-embryo-collapse.html

Jul 5, 2007 ... LYON, France – Scientists proposed a new theory this week for how identical twins are formed as embryos, in a discovery that may improve a ...

Answer
Identical twins come from one ovum, which, after fertilization, divides in two and develops into two separate individuals. Fraternal, or dizygotic, twins occur when the mother produces two eggs in one monthly cycle and both eggs are fertilized.
More Info

Twins - identical and fraternal - Better Health Channel

www.betterhealth.vic.gov.au

To form identical twins, one fertilised egg (ovum) splits and develops two babies ... The self-contained halves then develop into two babies, with exactly the same  ...

USATODAY.com - How eggs split to form identical twins

usatoday30.usatoday.com

May 9, 2001 ... How eggs split to form identical twins Q: In the case of identical twins, what triggers a single ... This is the stuff that an embryo will develop from.

Twins, triplets, and other multiples | womenshealth.gov

www.womenshealth.gov

Identical twins look almost exactly alike and share the exact same genes. Most identical twins happen by chance.