They are so similar... but are they really the same? Today we are going to speak about the difference between identical and fraternal twins.
First of all, a twin is one of two offspring in the same pregnancy. The main difference between identical and fraternal twins is that identical twins come from the same zygote that is divided in two different embryos, and fraternal twins come from two different zygotes fertilized by two different sperm cells.
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| Twin differences. Picture from www.genomesunzipper.org |
Ok, until now it seems easy, more or less. But in real life, what can make us differentiate between both types of twins? Here some clues:
