I heard that twins have the same blood type is this true?

Identical twins are basically a fertilized egg that separated into two embryos after its first division. Because they are from the same source, they are identical in every way. You are right, they have the same DNA, which means EVERYTHING about them is identical, hair color, skin color, blood type, eye color, sex. Believe it or not, if a woman has sex with two identical twins on the same night and gets pregnant, it will be IMPOSSIBLE to tell which one is the father. Fraternal twins are two separate eggs that are fertilized by two separate sperm that implant at the same time. They would have the same similarities as siblings born at different times. Hope this helps!!

identical twins would have the same blood type and DNA. The heart of each has a very small % chance of abnormality in any baby. Non-identical twins can have the same or different blood types, and different DNA.

It would be true that you and your sister share the same blood type. Because you are identical twins. And identical twins Share the same DNA as they came from a fertilized egg that split in half.

But fraternal twins don't most of the time because they do not share the same DNA. They come from two different mixes of DNA from there parents in two different fertilized eggs.

If you are identical twins, then yes you would have the same blood type, as well as identical genes.

And for trivia's sake, my fraternal twins have the same blood type- they're both the same type as I am.

EDIT: Oh, and to add a bit to Kari's answer- it is also possible to have sex with two men and conceive fraternal twins and have each man be the father of one of the babies...

If you are fraternal then there is a chance you can have differernt blood types, If identical you will share the same. :)