What is a potential disadvantage of GMOs?

The potential disadvantage of GMOs is the possibility of the spread of genetically modified genes to wild plants. This phenomenon, known as gene flow, can occur when GM crops cross-pollinate with their wild relatives or other compatible plant species. This can lead to unintended consequences in natural ecosystems, such as the creation of hybrid plants that may possess traits that allow them to outcompete native species or disrupt local biodiversity. The introduction of these genes can also pose risks for organic farming, as it can lead to contamination of non-GMO crops, complicating their cultivation and marketability.

In contrast, the other options highlight benefits or neutral characteristics of GMOs, such as improving nutritional value, reducing costs in food production, and decreasing the need for herbicides, which are generally seen as advantages rather than disadvantages.