Undergo genetic change (6)
I believe the answer is:
mutate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">undergo genetic change</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mutate that I've seen before include "Alter genetically" , "Convert" , "Change genetically" , "Undergo change to another form" , "Change genetic structure" .)