What is a transgenic organism?

A transgenic organism is defined as one that has been genetically modified to contain DNA from another species. This process allows the organism to express traits that are not naturally found within its own species. For example, scientists might introduce a gene from a bacterial species into a plant to give it resistance against certain pests or diseases, or add genes from one species of animal into another to study developmental biology or for agricultural improvement.

The correct identification of a transgenic organism is crucial in fields like biotechnology, agriculture, and medicine, as it enables researchers and farmers to enhance desirable traits, such as yield, resilience to environmental stress, or nutritional value. This genetic manipulation can lead to significant advances, allowing organisms to thrive in conditions they would not otherwise tolerate.

The other options do not accurately describe what a transgenic organism is. For instance, organisms that can produce their own food through photosynthesis or have enhanced immune systems do not necessarily involve genetic modification across species. Additionally, organisms that have not undergone any genetic modification are simply not transgenic by definition.