Final answer:
The use of grafting that is not an advantage is the production of a hybrid, because grafting involves joining two plants physically rather than creating a new genetically combined organism. Instead, genomics, not grafting, is used to create new hybrid strains and improve disease resistance in agriculture.
Step-by-step explanation:
The answer to the question, 'Which of the following is not an advantage or use of grafting?,' is 'produces a hybrid.' Grafting is a horticultural technique that physically combines two different plants. The primary reasons for grafting include the ability to get disease resistance of stock, by-pass the juvenile phase (thus accelerating the process of fruiting or flowering), and to change variety by introducing another type of cultivar onto existing rootstock. However, grafting does not produce a hybrid in the genetic sense of combining the DNA of both plants. Instead, it merely joins the tissues of two different plants so that they grow as one.
When we consider advances in genomics in agriculture, we see that they can be utilized to generate new hybrid strains and improve disease resistance among crops. Genomics can help in creating genetically modified organisms (GMOs) with specific traits, such as herbicide resistance or better yield.
It's important to note that while cloning, which involves creating genetically identical copies of a plant, can produce plants with advantages like improved disease resistance or higher fruit production, it also leads to reduced genetic variation, which could be a disadvantage in adapting to climate change.