How do full blooded siblings end up with such varying results from DNA testing?
In: Biology
The DNA that you got from both parents is different than the DNA your siblings got from them.
**Why?** (Optional)
Meiosis, the cellular-reproduction process that makes gametes (sperms and eggs), makes each sperm and egg unique.
Our ancient, ancient ancestors (some of the first animals to exist) were trying to make sure that every baby was born different, and therefore would have a different chance at survival. You wouldn’t make the same baby over and over again if it kept dying, right? But your body has no way of knowing it’s doing that, so it makes sure that every gamete it makes is going to be different in some way.
So, in siblings, the differences can be as small as different eye colours. It doesn’t change your survival chance, but your body is doing it as if it does.
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