Answer :
Monozygotic twins occur when a single zygote or fertilized egg splits apart in the first two weeks of development.
In monozygotic twins, the blastocyst then splits and develops into two embryos. Zygotic splitting occurs between second and sixth day when the zygote divides, in two parts, each zygote then develop into an embryo, leading to identical twins .
Identical, or monozygotic, twins may or may not share the same amniotic sac, depending on how early the single fertilized egg divides into two parts. Factors that increase the chance of twins include are dependency on high amounts of dairy foods, crossing the age of 30, and conceiving while breastfeeding.
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