You've probably heard of identical and fraternal twins. But a new report says there's a third kind -- sesquizygous or 'semi-identical' twins, so rare that only two cases have ever been identified
You've probably heard of identical and fraternal twins, but a report published Thursday says there's a third kind -- sesquizygous twins or"semi-identical."
Identical -- or monozygotic -- twins pop up from a single fertilized egg that eventually splits in two and forms two identical boys or two girls. 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.
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