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In order to know the meaning of the term phenotype it is necessary, first, to discover its etymological origin. In this case, we can state that it is a word that derives from Greek, since it is the result of the sum of two of that language:
-The verb “phainein”, which can be translated as “show” or “appear”.
-The noun “typos”, which is equivalent to “brand” or “footprint”.

The phenotype is called the variable expression of a genotype in a certain environment .

As you can see, it is essential to define genotype before moving forward with the concept of phenotype. The genotype is made up of all the genes of an individual according to his allelic composition (that is, according to the different forms that a gene can take by being located in the same site on homologous chromosomes).

The phenotype is the manifestation of this genotype depending on the ambient . The features expressed by the phenotype are behavioral and physicists and even go beyond the visible, since there are phenotypic characteristics that cannot be seen.

The observable traits of an individual, in short, are part of their phenotype. These are manifestations of the hereditary content that have undergone certain changes due to the influence of environment .

It can be said that the phenotype derives from the interaction between genotype and environment . Another way of understanding the notion involves thinking of the phenotype as the material manifestation of the genotype in a given means, medium .

It is important to be clear, of course, that the phenotype, although it is composed of the genetic traits of an individual, can change throughout its life. Thus, for example, a person may have a white skin color because he had it determined, however, that will change if, for example, he lives during countries where it is very sunny, he drinks a lot or eats foods that alter the color of your skin.

The link between the genotype and the phenotype is complex because it is crossed by the interactions that genes develop and the relationships established by the alleles within the same gene. That is why the phenotype is not only given by the state or characteristics of the genes: it also affects the sequence of environments that the genotype travels as it develops.

In the same way, we cannot ignore the existence of another term that uses the word that now occupies us. We are referring to the Bombay phenotype, which is used to mention a blood class that has the peculiarity that it is very rare. Why? Basically because it does not have antigens of membrane A or membrane B in what are called erythrocytes.

On that cited blood phenotype that we are addressing, it can also be indicated that the gene that comes to regulate it is found in what is chromosome number 19.

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