Twins can develop from one ovum (egg) or from two ova (eggs). Twins who develop from a single ovum are called monozygotic or identical twins. They have identical genomes. Twins who develop from two ova that are fertilized at the same time are called dizygotic or fraternal twins. They are nonidentical and have different genomes. A twin pregnancy comes with risks, both for the mother and the babies. Some moms hope to conceive twins or even higher-order multiples and will take active steps during fertility treatment to increase their odds. Other moms do what they can to avoid conceiving twins, but still get pregnant with more than one baby.
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Women's Health and Complications 