Question

Make a Punnett square and find out the genotypic and phenotypic ratios of F₂ generation in the progeny of a genetic cross between:

1. A pure tall (TT) pea plant with a pure dwarf (tt) pea plant.
2. Red flower variety of pea (RR) with white flower variety of pea (rr).

Answer 1

1. Crossed with pure dwarf (tt) plants, pure tall (TT) pea plants produced the following progenies:
   
   Genotype − 1 (Homozygous tall) : 2 (Heterozygous tall) : 1 (Homozygous dwarf)
   Phenotype − 3 (Tall) : 1 (Dwarf)
2. similarly the outcomes are as follows when crossing the red flower variety of pea (RR) with the white flower variety of pea:
   
   Genotypes Ratio RR : Rr : Rr : rr
   1 : 2 : 1
   Phenotype Ratio RR : Rr : Rr rr
   Red : Red : Red : White
   3 : 1