Which of the following is a disadvantage of conventional breeding for disease resistance?
It can result in genetic modifications that may have unintended consequences
It is a slow process and can take several years to develop new varieties
It is only effective for certain types of diseases
It requires specialized equipment and expertise
Conventional breeding for disease resistance is a slow process and can take several years to develop new varieties. This is because it involves selecting plants with desirable traits and crossing them to produce offspring with improved disease resistance. Hence, option 2 is the correct answer.