Question

Using the genotypes of a test cross can you give a General defination for a test cross?

Answer 1

a test cross is performed to identify the genotype of the test.
ex.   
if u have a tall plant and u want to find if it is a pure breeder or not then 
 
first u will assume the genotype to be TT/ Tt and cross it with a pure recessive type i.r. tt     if the plant is a pure tall then all the F1 generation will be tall 
but if its not then the recessive trait will show up in F1 gen.