• Question: why i am a girl ? ?

    Asked by sintesha to Paula, Nathalie on 17 Jun 2010 in Categories: .
    • Photo: Nathalie Pettorelli

      Nathalie Pettorelli answered on 17 Jun 2010:

      Hi there,

      Because your dad made you a girl 😉

    • Photo: Paula Salgado

      Paula Salgado answered on 17 Jun 2010:

      Hi Sintesha,

      Basically, because you have 2 chromossomes X.

      All our cells have 46 chromossomes, where our genetic material (DNA) is. However, the sexual cells (the mum’s ovum and the dad’s spermatozoid) only have 23 because they get only 1/2 of the genetic material. That way, when the ovum and spermatozoid are joined, the egg has 46 chromossomes. That’s why you inherit 1/2 your genetic information from your mum and 1/2 from your dad.

      All your mum’s ovum have X chromossomes but 1/2 of the dad’s spermatozoids has an X chromossome and the other half has Y. So the sex of a baby depends on which kind of spermatozoid it comes from, one that has X or one that has Y.

      Hope that explains it 😉

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