Correct Answer: Test cross

Solution : The correct option is test cross.

A test cross is a genetic cross made between a heterozygous plant and a homozygous recessive plant for a certain trait. The characteristic (rr) contains two recessive alleles in Homozygous Recessive Plant. It will always yield recessive allele (r) gametes.For the same characteristic (Rr), heterozygous Plan contains one dominant allele and one recessive allele. It will generate two types of gametes: those with the dominant allele (R) and those with the recessive allele (r). When a homozygous recessive plant is crossed with a heterozygous plant, if the dominant trait is present in all progeny, the dominant-expressing plant is most likely heterozygous.