What is dihybrid in pea plant …

Gregor Mendel performed dihybrid crosses on pea plants and discovered a fundamental law of genetics called the Law of Independent Assortment.Mendel chose to cross a pea plant that was homoygous and dominant for round (RR), yellow (YY) seeds with a pea plant that was homoygous and recessive for wrinkled (rr), green (yy)seeds

RRYY x rryy 

Organisms in this initial cross are called the parental, or P generation. The offspring of the RRYY x rryy cross, which is called the F1 generation, were all heterozygous plants with round, yellow seeds and the genotype RrYy.

Next, Mendel crossed two plants from the F1 generation. This step is the dihybrid cross, and it is represented as:

RrYy x RrYy

Mendel observed that the F2 progeny of his dihybrid cross had a 9:3:3:1 ratio and produced nine plants with round, yellow seeds, three plants with round, green seeds, three plants with wrinkled, yellow seeds and one plant with wrinkled, green seeds. From his experiment, Mendel observed that the pairs of traits in the parental generation sorted independently from one another, from one generation to the next.