The following questions ask how alike you and your twin were in your childhood. Please choose the most fitting answer for each question.

Were you and your twin “as alike as two peas in a pod"?

  1. As alike as two peas in a pod
  2. Usual sibling similarity
  3. Quite different

Were you and your twin mixed up as children?

  1. Yes, very often
  2. Now and then
  3. Never

By whom were you mixed up?

  1. Parents
  2. Teachers
  3. Others
  4. Nobody

The answers for each question are numbered. Add the answer number for each of your chosen answers to get a score from 3 to 10. This questionnaire is most accurate if the scores from you and your twin’s results are added together to get a score from 6 to 20.

A combined score of 6 to 13 indicates you and your twin would be monozygotic.

A combined score of 14 to 20 indicates you and your twin would be dizygotic.

Using the combined score from you and your twin’s results has a 93% chance of indicating your true zygosity. If you would like to confirm your zygosity we recommend a DNA zygosity test.

Using your answer score without adding your twin’s score won’t be as accurate but it will still provide an indication of your zygosity.

An individual score of 3 to 6 indicates you and your twin would be monozygotic.

An individual score of 7 to 10 indicates you and your twin would be dizygotic.

Twins Research Australia

Address: 3/207 Bouverie St
Carlton, Vic 3010

Freecall: 1800 037 021

Email: info@twins.org.au

ABN: 84 002 705 224

Twins Research Australia is a national resource supported by a Centre of Research Excellence Grant from the National Health and Medical Research Council and housed within the University of Melbourne.

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