The phenotype of an organism that is most commonly observed in nature is called the

Wild type

Explanation:

It refers to the phenotype that is found in nature. Naturally the form that is commonly seen in nature and is used for experiment is this type only.

This concept is useful in many experiment as it can be used as a model organism. Example: Drosophila melanogaster.

Manipulation of genes produces different type of phenotype other than wild type which is not generally seen in the nature.

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explanation:

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.