Definition of Dizygotic Twins

Dizygotic twins are those twins that arise when two eggs get fused with different sperms. Such a kind of twins is also known as fraternal twins and they are the most occurring type of twins. These twins are not similar to each other as they share only fifty percent of the total genome. The two ova are released by the ovary at the same time and then they are fertilized by two separate sperms.


The gender of these twins might be the same or different. The physical appearance and the blood groups are also different from these twins. The rate of occurrence of dizygotic twins is variable worldwide. The central and western parts of Africa have the highest rates of the occurrence of non-identical twins. The dizygotic twinning accounts for 2/3rd of the total twin births.


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