 Genotype. The genotype is the part of the genetic make-up of a cell, and therefore of any individual, which determines one of its characteristics phenotype. The term was coined by the Danish botanist, plant physiologist and geneticist Wilhelm Johansson in 1903. It is one of three factors that determine phenotype, along with inherited epigenetic factors and non-inherited environmental factors. Not all organisms with the same genotype look or act the same way because appearance and behavior are modified by environmental and growing conditions. Likewise, not all organisms that look alike necessarily have the same genotype. One's genotype differs subtly from one's genomic sequence, because it refers to how an individual differs or it's specialized within a group of individuals or a species. So, typically, one refers to an individual's genotype with regard to a particular gene of interest and the combination of alayals the individual carries see homozygous, heterozygous. Genotypes are often denoted with letters, for example BB, where B stands for one alayal and B for another. Somatic mutations which are acquired rather than inherited, such as those in cancers, are not part of the individual's genotype. Hence, scientists and physicians sometimes talk about the genotype of a particular cancer, that is, of the disease as distinct from the disease. An example of a characteristic determined by a genotype is the petal color in a pea plant. The collection of all genetic possibilities for a single trait are called alayals, two of alayals for petal color are purple and white.