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Fraternal Twins vs. Identical Twins. Fraternal twins are âdizygotic,â meaning that they developed from two different eggs fertilized by two different sperm cells, while identical twins are âmonozygoticâ i.e., they developed from a single fertilized egg that split.
Identical (Monozygotic) Twins. Identical Twins (Flickr: evilpeacock). Identical twins came from a single egg that split into two. Theyâre genetically identical and (obviously) always the same gender. Early first trimester ultrasound scan can identify approximately two-thirds of monozygotic twins.Our own twins were mis-diagnosed at a second-trimester ultrasound as identical (they werenât).raternal twins came from different eggs and are siblings, but not genetically identical. This is the more common type of twin, representing about two-thirds of twin pregnancies. When conceived naturally, fraternal twins indicate that two eggs were released by the motherâs ovaries instead of one.