Is it possible to determine the genotype of an individual only on the basis of visual observations

Is it possible to determine the genotype of an individual only on the basis of visual observations, in which cases, explain the answer.

The genotype characterizes an individual. The gene pool characterizes the entire population. It is impossible to completely determine the genotype just by observing the organism. We can only calculate individual genes. Genetics is a relatively young science that studies the genes of organisms and their heredity. To accurately investigate the genotype, it is necessary to use special equipment and technology. At home, this will not work. Moreover, not all laboratories are equipped for the study of genes.