In an experiment a phenotypic ratio 3:3:1:1 was obtained on crossing a pea plant with inflated ,green pods with another pea plant having inflated ,yellow pods .judge the accuracy of this result using a punnet square .write the genotypes of the parent
If we consider inflated and green pod colour as dominant trait, the genotype of parents that are crossed will be IiGg (inflated, green pod) and Iigg (inflated, yellow pod).
The gametes will be IG, Ig, iG, ig X Ig, ig
The cross will be
| IG | Ig | iG | ig |
Ig | IIGg (Inflated, green) | IIgg (Inflated, yellow) | IiGg (Inflated, green) | Iigg (Inflated, yellow) |
ig | IiGg (Inflated, green) | Iigg (Inflated, yellow) | iiGg (shrinked, green) | iigg (shrinked, yellow) |
The ratio of Inflated, green : inflated, yellow : shrinked green : shrinked yellow is 3: 3: 1:1.
Thus, in this cross the phenotypic ration will be 3:3:1:1 when the genotype of one parent will be with both heterozygous traits and another parent with one homozygous and one heterozygous trait.