Dizygotic refers to the conception of fraternal (non-identical) twins. This occurs when a female's ovary releases two eggs into the uterus that are both fertilized. These two separate gametes differentiate into two separate fetuses that mature into fraternal twins. This differs from monozygotic twins that occur due to an early splitting of the ova that results in identical twins (twins that look alike and share DNA profiles) and the occasional incidence of "Mirror Image" twins that are identical except for the reversal of organs and handedness.

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