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Twin

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?
www.ask.com/youtube?q=How Are Identical Twins Made?&v=wBVXR4SIHAA
Feb 12, 2013 ... does anyone know what causes identical twins? ... HOW BABY GROWS IN THE WOMB DURING PREGNANCY - How TWINS are made?

How You Get Pregnant With Twins or Multiples - Verywell

www.verywell.com/twin-pregnancy-2759468

Jun 14, 2016 ... Identical twins are made. This can happen with or without fertility drugs. In cases of IVF, there may be more than one fertilized egg put back into ...

Twins - identical and fraternal - Better Health Channel

www.betterhealth.vic.gov.au/health/conditionsandtreatments/twins-identical-and-fraternal

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/news/science/wonderquest/2001-05-09-why-twins-form.htm

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/pregnancy/you-are-pregnant/twins-multiples.html

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

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 ...

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 ...

Answers
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.