Suppose a gene from a cow is introduced into a frog. This results in a transgene.

Heterologous transgene.

Explanation:

Heterologous transgene can be defined as the expression of a gene from another animal into another. Such an animal that this gene is introduced to does not have such a gene in them naturally, this is done through a firm of DNA technology.

So when a gene from an animal such as a cow is put into another animal like the frog, the result is heterologous transgene.