The story behind this post is that my wife recently gave birth to our first son and we experienced a funny story about genetics the day following the birth. Before I start I should say, to reassure the reader, that I have no doubt that I am indeed the father of my child. But as you will see, a non-geneticist might have become worried when faced with the same situation.
Firstly, my wife has a negative rhesus type. This has important medical implications because if the baby were to have a positive rhesus type, she would create antibodies against this marker which could be life-threatening for any subsequent child of positive rhesus type. Basically this is a relatively big deal, but there are ways to deal with this, and therefore knowing the blood type of the baby is essential.
The day after the birth, while we are both lying on our bed, very tired, a midwife comes by and asks us whether we know the rhesus status of the baby. We answer negatively, she checks her notes and says, “Ah, good news, the baby is rhesus negative. The father must also be rhesus negative then!” Well, I am not…
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