Final answer:
Scientists creating transgenic mice use biotechnology to alter a mouse's genetic makeup in vitro, leading to the expression of traits from different species.
Step-by-step explanation:
Scientists can construct specific genetic alterations of a gene in vitro and then use biotechnology to replace a normal gene in a mouse with the constructed altered gene.
This results in the creation of a transgenic mouse. Transgenic mice are powerful tools in research and are widely used to understand gene function, study diseases, and develop medical treatments.
These mice possess recombinant DNA, which includes genetic material from a different species, allowing them to express traits that are not naturally found in their species, such as producing human proteins for medicinal purposes.