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How are non-identical twins made?

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Non-identical twins form when two eggs are fertilized at the same (or nearly the same) time. The medical term for fraternal twins is dizygotic, which means that they are formed from two separate zygotes. They share about 50% of the DNA of their parents. read more

Nonidentical twins occur when a woman produces two separate eggs that are then fertilized by two different sperm cells. The resulting twins sometimes look alike, but have separate genetic identities, like children of the same parents born during different pregnancies. read more

Non identical twins are born when two different eggs are fertilised at the same time. Those who come from the same egg share similar physical features and usually the same personality. Non identical twins do not look the same but their personality can be after same due to family influences. read more

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How are twins formed?
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