Board Thread:Naruto Discussions/@comment-1018594-20160409062530/@comment-1512913-20160502012559

I think the reason why White Zetsu's DNA is identical or close to identical to Hashirama's, even though his cells were added later on, is because White Zetsu have no DNA whatsoever. Simpy put, as you said, they are empty animated shells of former humans, that can shape into others.