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How are identical twins and fraternal twins formed?

April 26, 2017formed fraternal identical Parenting pregnancy twins

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How are identical twins and fraternal twins formed?

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Identical twins are formed when ONE egg gets fertilized and then splits in half after fertilization.. both parts of the egg implant into the uterine wall and develop into identical twins. Fraternal twins occur when two eggs are released and fertilized by separate sperm… they both implant into the uterine wall and form into two separate babies. Here’s a great diagram. http://myhealth.ucsd.