Question

If dwarf pea plant was treated with Gibberellic acid, it grew as tall as the pure tall pea plant. If this treated plant is crossed with a pure tall plant then the phenotypic ratio of is likely to be [AIIMS 1980; BCECE 2005]
A) All dwarf
B) 50% dwarf 50% tall
C) 75% tall 25% dwarf
D) All tall

Answer 1

answer is option D).

Answer 2

Answer:

Here in the question a special case is described in which a dwarf plant with treated with gibberlins and its phenotype has been changed tall from Dwarf.

Explanation:

If such plant is crossed with pure tall plant the generation obtained will show 75% tall plants and 25% dwarf plants.

This is because if the dwarf plant is treated with gibberlins physical changes occur but there will be no change in its genotype.

According to Mendel when F1 generation cross is made between two parents of opposite characters in their Geno type the resultant plants are 75% of dominant character and 25% of recessive character.

Interland vah freez tall is dominant character anddwarf is recessive character.