It's one of the first questions that people ask about twins: are they identical or fraternal? It's not always an easy question to answer, as many parents don't know for sure. Zygosity is the term used to describe twintype. Most people describe twins as "fraternal" and "identical," but the more accurate terms are monozygotic and dizygotic. What about your multiples? Take this week's Parent's Poll.

What is the zygosity of your multiples?

• Confirmed monozygotic (identical).
• Suspected monozygotic (identical).
• Confirmed dizygotic (fraternal).
• Suspected dizygotic (fraternal).
• Unknown.
• Mixed - triplets or higher order mulitples that are a combination of monozygotic and dizygotic.

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