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Sometimes, factors during the pregnancy, especially twin to twin transfusion syndrome, can lead to identical twins that have very different birth weights and are mistakenly thought to be fraternal. And sometimes, fraternal twins can look enough alike to be confused with identical twins.
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www.keepkidshealthy.com/twins/expecting_twins.html
www.keepkidshealthy.com/twins/expecting_twins.html
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Fraternal twins share up to 50% of their genes, and are no more alike or different than any two siblings would be. The similarity between fraternal twins can be close to identical - there are many fraternal twins that look identical - even more identical than some identical twins!
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www.multipletreasures.com/facts-about-fraternal-twins.p...
www.multipletreasures.com/facts-about-fraternal-twins.php
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It’s minor, and correctable if it causes her any grief, but we would have never dreamed that the girls were identical had we not known it for a fact. A pair of fraternal twins I went to college with look FAR more alike than my identical girls.
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howdoyoudoit.wordpress.com/2008/04/16/the-incredible-id...
howdoyoudoit.wordpress.com/2008/04/16/the-incredible-identical-fraternal-twins/
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Twin - Wikipedia, the free encyclopedia
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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, colloquially "identical") or d...
en.wikipedia.org/wiki/Twin
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However, since physical appearance is influenced by environmental factors and not just genetics, identical twins can actually look very different. Identical twins are always same-sex sets. ... Twin Pregnancy FAQ: Are My Twins Identical or Fraternal?
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multiples.about.com/cs/funfacts/a/twinzygosity.htm
multiples.about.com/cs/funfacts/a/twinzygosity.htm
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Interestingly, they can as dissimilar as some singleton siblings OR they can look like identical twins! Did you know Mary Kate and Ashley Olson are actually only fraternal twins, yet look identical? The only way to be sure whether your twins are truly identical, then, is to take a genetic test to see the overlap of DNA.
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www.pregnancy-info.net/facts_about_twins.html
www.pregnancy-info.net/facts_about_twins.html
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Identical twins(and triplets!) come from the splitting of only one fertilized egg. These twins are called identical because, of course, they will have the same identical DNA (genes). Fraternal twins will look similar, but like brothers.
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www.gynob.com/fratidentwins.htm
www.gynob.com/fratidentwins.htm
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Identical twins and fraternal twins - what's the difference? A look at what the most common questions about twins: What makes a twin a twin? How does an identical twin happen? What are fraternal tiwns? ... Home Articles Identical or Fraternal Twins...
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www.multiplemom.com/articles/identical-or-fraternal-twi...
www.multiplemom.com/articles/identical-or-fraternal-twins.html
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Because of advances in medical technology, there has been an increase in twin births in recent decades. There are two separate typs of twins: fraternal and identical. Both types are different from one another. Fraternal twins, which are oft...
http://www.thelaboroflove.com/articles/how-are-fraterna...
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