Ans. We can determine the Genotype by sending a sample DNA test. Until we have done that, all we can do is only a wild guess. Our genotype is not the ethnicity results. It is exactly how our deoxyribonucleic acids are lined up in each chromosome. Also, there are some phenotypes that cannot be any other genotype. Someone who is albino knows they don't have a gene that codes for active melanin.A Siamese cat always has two genes that can make only melanin at slightly at low body temperatures. These genes are called recessive genes. At least, everyone has a few pretty much dominant genes. Before the DNA test, if someone wanted to know whether an animal was homozygous for a dominant trait, a breeding test was often done. If such an animal was bred with a homozygous animal for the corresponding recessive gene, and all the offspring had the same phenotype, it was safe to assume that the animal was homozygous fairly. If some of the offspring were similar to the homozygous parent, the animal was heterozygous (having both dominant and recessive gene), that works much better with mice and rats than with animals that only produce a few offspring in their lifetime!