劣性 れっせい遺伝 いでん形質 けいしつだったら
resse ii den keishitsudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 劣性遺伝形質

1. If/when it were a recessive trait.; If/when it turned out to be a recessive trait.

Tara Conditional