Question

why test cross is regarded as back cross?

Answer 1

Back cross- When F1 individuals are crossed with one of the two parents from which they were derived, then such a cross is called a back cross.
 Test cross- A test cross is a crossused to test whether an individual is homozygous ie pure or heterozygous ie hybrid. It is always crossed with a recessive parent.
Every test cross is a back cross because in it F1 generation is crossed with one of the parent and is used to know the genotype of F1 generation.