The genotype of a plant showing a dominant phenotype can be determined by

A. Backcross

B. Dihybrid cross

C. Testcross

D. Pedigree analysis

Answer: Option C

Solution(By Examveda Team)

The zygosity of F₁ generation can be checked by test cross method. In a test cross : The organism with the dominant trait is always crossed with an organism with the recessive trait. If any offspring show the recessive trait, the unknown genotype is heterozygous.
If all the offspring have the dominant trait, the unknown genotype is homozygous dominant.
Large numbers of offspring are needed for reliable results.