Identical twins have the same DNA, fraternal twins dont... they share about the same amount of DNA as regular siblings (although they tend to be more similar than other siblings because they are in the same cohort)
like ichibanarky said- identical twins 1 egg splits in half= 2 babies formed (identical/simese twins). fraternal twins 1 egg from both falopian tube is inseminated (two different babies)
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Fraternal and identical twins
Why are identical twins much more similar than fraternal twins?