In testcross :

Easy

A

The organism expressing the dominant phenotype but having an unknown genotype is crossed with a known homozygous recessive individual.
B

The organism expressing the dominant phenotype but having an unknown genotype is crossed with a known heterozygous dominant individual.
C

The organism expressing the recessive phenotype is crossed with a known homozygous dominant individual.
D

The organism expressing the recessive phenotype is crossed with a known heterozygous dominant individual.

Solution

In testcross, the organism expressing the dominant phenotype but having an unknown genotype is crossed with a known homozygous recessive individual.

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