If all plants in the first generation of pure tall and pure dwarf pea plants are tall, what is the correct conclusion about the dwarf trait?

Correct answer: Dwarf trait remains hidden and is recessive

The governing concept is dominance in Mendelian inheritance. Let tallness be T and dwarfness be t. A pure tall parent is TT and a pure dwarf parent is tt, so every first-generation offspring receives T from one parent and t from the other, giving Tt. Because T is dominant, all plants look tall, while the t allele remains present but is not expressed. Thus option B is correct; the dwarf trait is hidden, not destroyed.