Test Cross:  Cross between an individual of unknown genotype (hybrid) with an individual which is homozygous for recessive trait is test cross.

Use:

1. Important to know about the unknown individual.
2. Important tool of genetics.

Conclusion: If we get 5% dominant and 50% recessive character, then unknown individual must be heterozygous.

Conclusion:- If we get all dominant character, then the unknown individual must be Homozygous for dominated character.