When on F1 is crossed with the recessive homozygous parent the cross is known as

Answer: Option C

When F₁ is crossed with the recessive homozygous parent the cross is known as the Test cross.
Under the law of dominance in genetics, an individual expressing a dominant phenotype could contain either two copies of the dominant allele or one copy of each dominant and recessive allele.
In a test cross, the individual in question is bred with another individual that is homozygous for the recessive trait, and the offspring of the test cross is examined.