Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/Rude-Highway-9544 on 2023-10-07 05:21:35.

My girlfriend and I were lying in bed watching a murder mystery, and it brought up a son doing a DNA test to see if his father was the killer.

Anyways, we both are curious how you could be anything more than a 50% match to your parent, being that you are a 50/50 mix of both your mother and father.