Question

A homozygous tall plant (T) bearing red-coloured (R) flowers is crossed with a homozygous dwarf (t) plant bearing white (r) flowers:

1. Give the genotype and phenotype of the plants of F₁ generation.
2. Mention the possible combinations of the gametes that can be obtained from the F₁ hybrid plant.
3. State Mendel’s law of independent assortment.
4. Mention the phenotypes of the offsprings obtained in F₂ generation.
5. What is the phenotypic ratio obtained in F₂ generation?

Answer 1

1. Genotype of F₁ generation: Heterozygous Tall with Red flowers (TtRr)
   Phenotype of F₁ generation: All heterozygous tall and red.
2. 1. Tall and Red (TR)
   2. Dwarf and Red (tR)
   3. Tall and White (Tr)
   4. Dwarf and White (tr)
3. Mendel’s law of independent assortment states that when the parents differ in two or more alleles, then the inheritance of one pair of alleles does not depend on the other pair.
4. Tall red, Dwarf red, tall white, dwarf white.
5. 9 : 3 : 3 : 1