Genetics Makes me Silly

So I'm reading cake wrecks (as should all of you) and it is all about patriotic/9-11 cakes and it included this jem:



Apparently it is supposed to be fireworks, I think, actually I don't really know. BUT I am a huge dork, I have to draw a lot of diagrams in my genetics class (very basic diagrams mind you) and all I could think when I saw this cake was: What do chromosomes have to do with 9/11?