question_answer

If a dwarf plant is treated with gibberellins it becomes tall and this plant now crosses with pure tall plant then progeny of first generation (Fi) is :

A)  all dwarf

B)  all tall

C)  75% tall and 25% dwarf

D)  75 % dwarf and 25 % tall

Correct Answer: B

Solution :

If a dwarf plant is treated with gibberellins it becomes tall but its genetic makeup is similar to other dwarf plants. Therefore, offspring obtained from cross between dwarf plant (gibberellin promoted tall) and pure tall plant will be heterozygous tall.