Under which circumstances twins are born in human
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- Fraternal (Non-identical) twins are formed when two egg cells are fertilized; each egg by a different sperm so that two embryos are formed.
- Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves. The two halves are genetically identical.
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Twin is a two offspring produced in one pregnancy.
It can either be identical twins meaning one zygote splits and forms two embryos or fraternal twins meaning they develops from two eggs each ferterlised by separate sperm cell
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