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TWINS
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Monozygotic twins Monozygotic twins (identical twins) are identical genetically. Identical twins that share the same placenta occur in only 1% of the pregnancies. This is due to a relatively late egg split. In utero mortality rate is about 50% due to cord entanglements.
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Identical twins in utero
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Triplets, quadruplets, quintuplets etc.
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Conjoined twins An extremely late split of identical twins can cause conjoined twins. They fail to separate completely. Abby & Brittany Hansel
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Dizygotic twins Dizygotic twins (fraternal twins) are as similar genetically as any other brother or sister.
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Dizygotic twins
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Fraternal twins at 32 weeks
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President Bush’s Daughters
Fraternal twins (dizygotic)
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