Friday, October 9, 2009

Proving or Disproving Paternity

My mother-in-law used to say that "paternity is by faith". Meaning, technically, you are never sure about a child's father except by believing that you and your wife made a baby together. That was unlike being a mother, wherein a mother is always sure that her child is hers because she carried it in her womb for nine whole months. Of course, this was before all the modern advancements like in vitro fertilization and DNA testing came along.

Still, there's a simple way to disprove paternity, if the need arises. This is a much cheaper, although cruder way, and it does not always applicable.

You can look at the blood types of the child, the father and the mother.
  • If the child is type AB, one of his parents have to be type A and the other type B. No exceptions.
  • If the parents are both type O, they can only have type O children.
  • If one parent is type A and the other is O, the possible blood types for their children are type A and type O only.
  • If one parent is type B and the other is O, the possible blood types for their children are type B and type O only.
  • If one parent is type AB and the other is type O, their children can be type A, type B, type O but never type AB.
  • If both parents are type A, their children can be either type A or type O. If both parents are type B, their children can be either type B or type O.
  • If both parents are type AB, their children can be type A, type B, type AB but never type O.

Confused? You can simply ask your doctor about it. The logic is in genetics, dominant and recessive genes. Type A and B are dominant, while type O is recessive. Although, as I've mentioned, it's not always applicable. In case of doubts, there's always DNA testing for paternity.

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A part time ophthalmologist, part time micro business owner, part time graduate student and FULL TIME MOM struggling to find balance in the confusing world of multitasking :)

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