Zygosity

Over the last year or so we have increasingly thought that our twin daughters might be identical – in spite of King’s College Hospital telling us they were not. As a result, and thinking about the forthcoming school application process, we decided to pay for a zygosity test. We got the results recently, and … it has been confirmed they are monozygotic (the modern term for identical) with a probability of 99.99999109% – ok, pretty sure.

Some interesting facts about monozygotic twins:

  • The odds are 3 in 1,000 of having monozygotic twins
  • Only a third of all twins are monozygotic
  • Their DNA is identical
  • Monozygotic twins do not have identical fingerprints
  • There is no scientific evidence to suggest that Extra-Sensory Perception (ESP) exists in twins
  • Their children will be half siblings and not first cousins
  • Personality similarities increase as monozygotic twins age.

We also heard from other families who found out their twins are identical. As a result with TAMBA’s support, we raised this issue with Kings College Hospital.  Kings College Hospital now make expectant parents aware that their twins can still be identical even if they have separate placentas.

Leonie and David, mum & dad to Leah and Eve, 3

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Dulwich and District Twins Club monkeys