By Angelica Degnan, Genetics ’15 Oh complementation testing whatever do you do? How does thee help me explain the mutants true? Begin with two recessive strains Cross, observe, unearth the ones that are the same What does this mean? How do you explain the ones that function redundantly through? Complementation, complementation alas I see the light That alleles that are mutants a like, when united, cannot avoid their destined plight But mutants in two different genes stand a fighting chance They work independently, and can lend a helping hand If one should fail, be lost forevermore another can step in a lead expression forth Complementation testing, you are a godsend for sure I can now see the wonders that you produce in scores! This poem appears in the video “Complementation Test” by Angelica Degnan and Biochemistry and Molecular Biology major Ngoc Pham.