
but my DNA gets mixed
with the ape's DNA
The Big Bang Theory Season 7, Episode 17

...for fingerprinting and DNA analysis.
The Big Bang Theory Season 4, Episode 7

I have a sister with the same basic DNA mix
who hostesses at Fuddruckers.
The Big Bang Theory Season 1, Episode 1

Oh, sure, '’cause
Sheldon'’s DNA plus my DNA
The Big Bang Theory Season 12, Episode 3

Who's to say
that I don't share that flawed DNA?
The Big Bang Theory Season 4, Episode 2