Question

A dwarf pea plant was treated with GA. The plant became tall. The treated plant was then crossed with a homozygous tall pea. The results in $F_2$ are expected to be

• A. All tall
• B. Tall and dwarf in 3 : 1 ratio
• C. 50% tall
• D. All dwarf

Answer 1

The correct option is B Tall and dwarf in 3 : 1 ratio

A gibberellin treated dwarf pea plant(tt) is crossed with homozygous tall plant. The F1 is progeny is tall. When the F1 plant is self pollinated, in the F2 generation 3 tall plants 1 dwarf plant are formed. The reason is gibberellins not effect the genetic material of the parents. They concerned in the elongation of internodes in that plant. Phenotypic ratio is 3:1 and genotypic ratio is 1:2:1

So, the correct option is Tall and dwarf in 3:1 ratio.