When a zygote splits into two after fertilization, it results in identical twins (also known as monozygotic twins). These twins originate from the same fertilized egg and share the same genetic material, which means they are genetically identical. This is different from fraternal twins (dizygotic twins), which occur when two separate eggs are fertilized by two separate sperm cells.
The sperm cell fertilises the egg cell, forming a zygote. After fertilisation, the zygote splits into two. This will result in the following type of twins:
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