When a second yeast gene, TPM2, was deleted, no observable changes in the phenotype were recorded; however, when deleted in combination with TPM1, it resulted in lethality.
Ao eliminar un segundo xene neses lévedos, o xene TPM2, non houbo cambios observables no fenotipo; porén, cando se eliminaba en combinación co TPM1, esta deleción dobre era letal.