Final answer:
Creating transgenic animals with fluorescence raises ethical concerns and health implications, and could lead to diminished respect for animals as living beings. It is not advisable to commercially exploit genetically modified animals as pets.
Step-by-step explanation:
I would not favor creating glow-in-the-dark animals for sale as pets because such genetic modifications raise ethical concerns, may have unforeseen health implications for the animals, and could lead to a commodification of living beings that reduces respect for their intrinsic value.
Transgenic animals, like the fluorescent mice, are primarily developed for research to study cell processes, genetic diseases, and the production of recombinant proteins necessary for medicine. Although the creation of fluorescence in animals can have scientific benefits, using these genetically modified organisms (GMOs) as pets can trivialize the seriousness of genetic engineering and lead to welfare issues.