Do fraternal twins have the same dna?

If twins are a boy and a girl, clearly they are fraternal twins, as they do not have the same DNA. A boy has XY chromosomes and a girl has XX chromosomes. Girl-boy twins occur when one X egg is fertilized with an X sperm, and a Y sperm fertilizes the other X egg. read more

Also, some things in development are a little bit random, and not just due to DNA. For example, identical twins have similar, but not identical, fingerprints. Answer 2: Identical do have the same genotype. After all, they come from the same fertilized egg. read more

Seeing as every egg cell and every sperm cell in the human body have different genetic codes due to random assortment, meiosis and other forms of genetic variation, the chances of having fraternal twins with identical DNA is next to nothing. read more