Question

How would you find out whether a given tall garden pea plant is homozygous or heterzygous? Substantiate your answer with the help fo Punnett squares.

Answer 1

Test cross helps to find out whether the given tall garden pea plant is homozygous or heterzygous.
When a progeny of F1, is crossed with the homozygous recessive parent, it is called test Cross.
Test cross between pure dominant (A) and hybrid dominant (B) individuals with recessive parent is shown below :

Such a cross is useful to determine the genotype of an unknown trait, i.e., whether it is heterozygous or homozygous dominant for the trait.