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Image courtesy of University of North Texas Dept of Biological Sciences |
As I have mentioned before, Birdie and Princess are identical twins. Recently, Birdie has really been fixated on and fascinated by the fact that her sister is called her "identical twin", and yet there are many differences between them. Being very literal in speech, every time this comes up, Birdie is really bugged by the discrepancy. The fact that she and Princess have the same genetic material-- which is supposed to define you-- and yet they are so very different really drives Birdie's need to understand how DNA works. I have not wanted to get into a huge amount of detail with her about the mechanics of genetics-- mainly because I am pretty sure I would run out of info before she was satisfied. We have, however, talked a tiny bit about how a baby's womb environment can change its DNA expression. She was not impressed by this explanation, and has apparently given the whole identical DNA thing a lot of thought.
Last week, Birdie and I had the following conversation: