遺伝いでん突然とつぜん変異へんいではありませんでした
idenshitotsuzenhen'idewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 遺伝子突然変異

1. Was not a gene mutation.

Past/Perfective
Negative
Polite
Formal Register
Genetics