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When I was a little girl, I often asked my mom why I had brown eyes when she had bright blue eyes. Surely if I was her daughter, I would also have the blue eyes that I so hankered after? She would always smile and patiently explain to me that things like the colour of your eyes or hair; or the shape of your hands and feet are things that you inherited from your parents, and that there was no way of telling which bit you’d get from which parent.