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Do fraternal twins develope from a single fertilized egg?
No.
Why are the twins identical?
Twins are not necessarily identical. They can be fraternal as well. Identical twins result when one fertilized egg splits in two. Fraternal twins result from two fertilized eggs.
How are identical twins genetically from fraternal twins?
Identical twins are genetically the same, because they come from the same fertilized egg/sperm cell zygote, which happens to split into two viable zygotes. Fraternal twins, however, come from two different egg/sperm cell zygotes, that are concurrently fertilized and remain viable.
What would the result be if two eggs were released at the same time and both were fertilized but before implanation one of them divided into two?
If two eggs were released at the same time, both were fertilized, and one later divided in two before all three were implanted, you would have triplets with two identical and one fraternal triplet.
How do fraternal twins devolpe?
two separate and distinct eggs are fertilized at the same time growing in the womb together, but having different DNA.
