Trait, expressed in the phenotype if present in the genotype, that precludes having descendants.

This is biology and is called heredity or genetics.

Dominant in science means either 'expressed' in genetic terms or 'widely held and accepted as the basis of comparison' in general terms such as "the dominant view".

recessive (sraight out of my biology lesson!)

Trait simply means - quality or character

for example - if we say the mango has a yellow color, then yellow color is a trait of the mango