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How are twins formed?

How are twins formed?
Liam Mcherson from Stockton on Tees (Aged 5-14)

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2 Responses

  1. How twins are formed depends on the type of twins, identical or non-identical.

    Identical twins are formed when one egg gets fertilised and then starts dividing. When the bundle of cells is still very small it splits into two and both carry on dividing. This means there are two bundles of cells that are exactly the same and these will grow to be a pair of identical twins.

    Non-identical twins are formed when two different eggs get fertilised. Each egg is different so two non identical twins are formed

  2. There are two main ways that twins happen.

    The most common is “Dizygotic twins” where the mum has released two eggs at the same time and both fertilise and implant in the womb.

    Monozygotic (identical) twins occur when one fertilised egg divides into two separate embryos very soon after fertilisation.

    The number of twins in the UK has increased over the last few years as many fertility treatments such as IVF involve putting two embryos back into the womb – giving a higher chance of dizygotic twins!

    For more information see:
    http://en.wikipedia.org/wiki/Twins

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