Testing 1-2-3

15 Jun

The wheels started turning. How could I solve this mystery? I was laying in bed, ready to go to sleep and it hit me. The light bulb over my head lit up!!! I whipped out my phone and started to google immediately. There had to be a test for this! There is a test for everything 😉

There is was. In black and white in front of me. A sibling test. A DNA test to specifically determine if two people are siblings, half siblings, etc. This was it! My answer to it all. All we would have to do is convince daughter #1 to take the test and we would know for sure.

I turned off the lights and tried to get to sleep. An act that seemed much harder than normal as my brain was working in over drive. The next morning I began to research the test. I found multiple places that could perform it. I could feel the excitement build. Once you take the test it is just days before you get the results! I was so happy.

Of course the detective in me..the girl that needs to know all the details, ins and outs, all the fine print before ever doing something..came out to play. I poured over the FAQ’s, product information, etc. And then I found it. The proverbial road block. These tests can determine whether you are siblings (or half siblings) but not in the case where the potential fathers are brothers.

Boom, excitement crushed. My easy resolution to solve the puzzle had been blown to pieces. But why? Why wouldn’t it work?

After a few phone calls to a couple of DNA laboratories I better understood. When a child is conceived, they get 50% of their DNA from their mother and 50% from their father. What percentage you are getting from each parent is a free for all. For example: Tom got 50% of his father and 50% of his mother. In his father’s 50% he got a larger percentage from his father’s paternal side. Tom’s Brother Peter got 50% of his father and 50% of his mother. In his father’s 50% he got a larger percentage from his father’s maternal side. This breaks down to the fact that two FULL siblings do not have the exact same DNA.

Now consider half siblings. If you have different mothers and the same father, you already eliminate half of your DNA. The fun fact is, cousins and half siblings share the same percentage of DNA. That means, depending on the Russian roulette of genetics, you can have more DNA with a cousin than a half sibling. Imagine that. So if daughter #1, daughter #2 and I took a a DNA test, the results could come back that daughter 1 is my sister and daughter 2 is my cousin when in fact it is the reverse! The only way to truly know is a paternity test. Yikes! The dreaded paternity test! The one thing that I hoped would not be the be all end all!

 

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