• Question: my sister and i are twins.we look alike . what causes twins

    Asked by ibra to Dorcas on 30 Sep 2014.
    • Photo: Dorcas Kamuya

      Dorcas Kamuya answered on 30 Sep 2014:

      Dear Ibri,
      Twins are formed when a) two different ovaries are fertilised at the same time by different sperms – which can happen when two eggs are released during ovulation or b) when two sperms both fertilise the same egg, whose nucleus then splits into two babies – identical twins.
      Dorcas

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