TWINS

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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 Bushs Daughters

• Fraternal twins (dizygotic)