Answer:
Wild type
Step-by-step 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.