Question

“Why Are Identical Twins Rare?”

Answer 1

because zycote can not be divided into two.in rarer cases only zygote will be divided.

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Answer 2

Answer:

They share 100% of their DNA. Fraternal -- or dizygotic -- twins form from two eggs that have been fertilized by two of the father's sperm, producing two genetically unique siblings. They share 50% of their DNA. But "semi-identical" twins are so rare, experts say they have only identified two cases -- ever.