Q.Among the pea plant cell which one has the ability to convert a precursor molecule into an active form ?

The dominant Le allele encodes the enzyme that converts an inactive gibberellin precursor into its active form (GA1), producing tall pea plants.

Mendel's classic tall/dwarf pea trait has since been explained at the molecular level: the Le locus encodes an enzyme (GA 3beta-hydroxylase) in the gibberellin biosynthesis pathway. The dominant Le allele produces a fully functional enzyme that converts an inactive gibberellin precursor (GA20) into the biologically active gibberellin GA1, which promotes internode elongation and produces the tall phenotype. The recessive le allele carries a mutation that renders this enzyme non-functional or much less active, so le/le plants accumulate the inactive precursor but cannot efficiently convert it to active GA1, resulting in the classic dwarf phenotype -- a beautiful molecular confirmation of Mendel's originally purely phenotypic dominant/recessive model. Among the options, GA1 is the active hormo …