Selective breeding and gene technology

Selective breeding and gene technology are two powerful methods humans use to modify the characteristics of organisms. Selective breeding, also known as artificial selection, involves choosing parents with desirable traits to produce offspring with those traits. This process has been used for thousands of years to improve crops, livestock, and even pets. For example, modern wheat varieties have been selectively bred for higher yields and disease resistance, while dogs have been bred for specific behaviours and appearances. Understanding selective breeding is essential because it forms the basis of many agricultural practices and helps explain how evolution can be directed by human choice.

Gene technology, on the other hand, involves directly manipulating an organism's DNA to achieve desired traits. This includes techniques such as genetic engineering, where genes from one organism are inserted into another, and gene editing, which allows precise changes to an organism's own DNA. A classic example is the production of insulin by genetically modified bacteria, which has revolutionised diabetes treatment. Gene technology also raises important ethical and safety considerations, such as the potential impact on ecosystems and the debate over genetically modified (GM) crops. In the WJEC GCSE Biology course, you will explore both the science behind these technologies and their real-world applications, as well as the arguments for and against their use.

This topic connects to broader themes in biology, including inheritance, variation, and evolution. By studying selective breeding and gene technology, you will understand how humans can influence the genetic makeup of organisms, and you will be able to evaluate the benefits and risks of these interventions. Mastery of this topic is crucial for exam success, as questions often require you to compare traditional breeding with modern genetic techniques, and to discuss ethical implications. You will also need to recall specific examples, such as the selective breeding of cows for increased milk yield or the genetic modification of crops for herbicide resistance.