system
Given the following post, respond as if you're commenting on Reddit:
human
Before genes are sequenced, how do scientist make sure they are using the genes from the right organism?

As a birthday present I am getting my genes sequenced by a private company. For my sample they send a tube that I have to fill with spit then seal, shake and send back.  
Once they get my sample how do they make sure that its actually my genes that are sequenced and not some bacteria or other organisms  (cow cells from a recent rare steak or something)?
gpt
The tests use human specific primers/probes for DNA amplification and sequencing, and the sample tube has chemicals that retard bacterial growth. Most of the interference from bacteria is a degradation of human DNA in the sample, it's not really possible to sequence the bacterial genome instead of yours.