The concept “Test cross is a back cross, but a back cross is not necessarily a test cross” highlights differences in genetic approaches.
A test cross unveils genotype by breeding with a homozygous recessive individual. It observes phenotypic ratios in offspring.
A back cross mates an organism with a parent or a genetically similar individual. While a test cross is a specific instance of a back cross, not every back cross aims for genetic testing.
In summary, every test cross is a form of back cross, but not all back crosses specifically test a genotype.