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Fraternal twins are born when:

two sperms fertilise one ovum

two sperms fertilise two ovums simultaneously

one sperm fertilises the ovum and zygote divides into separate cells developing independently.

one sperm fertilises two ovums

Explanation:

Fraternal twins occur when two separate eggs are fertilized by two separate sperm. Two separate babies with no more in common than siblings born at different times are formed. About 2/3 of twins are fraternal.

By: Deepak Thakur

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