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Dizygotic twins occur when two separate eggs are fertilized by two different sperm cells, leading to genetically independent siblings. This type of twinning is the most common in nature and is frequently initiated through fertility treatments that involve superovulation, such as Clomid, Letrozole, or injectable hormones.
Monozygotic Twins
Monozygotic twins arise when a single fertilized egg splits into two embryos. This can occur at various early stages of development, leading to distinctions in the type of shared structures, such as placentas and amniotic sacs, resulting in different risks associated with these pregnancies. Notably, monozygotic twins have a higher incidence in IVF, where mishaps during embryo manipulation can encourage these splits.