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Twins that derive from a single zygote that has split into two are called:

User UXdesigner
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Hey there!

These are known as identical twins because since they derive from a single zygote, they have the same DNA. This rarely happens. If two sperm cells fertilizes 2 eggs, they are fraternal twins. This means they are twins, but not similar.

I hope this helps!
User Shinell
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They are colloquially known as identical twins. Technically, they are monozygotic twins.
User Gabriel Jensen
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