遺伝いでん突然とつぜん変異へんいじゃなかったです
idenshitotsuzenhen'ijanakattadesu

Noun
Desu Copula

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

1. Wasn't a genetic mutation.

Past/Perfective
Negative
Polite
Casual Register
Genetics