A description of the processes used in artificial and selective breeding of racing horses. Only horses successful on the race track are selected for breeding, so a horse will inherit good racing characteristics from both its parents. When the process is repeated over many generations, a horse is created that is specifically adapted for racing - light build, large, strong muscles, small legs, a thick set jaw and wide nostrils for maximum air intake at high speeds. Comparisons are made between this and natural selection.
Students could make a list of the adaptations of a racehorse to do their job and describe the adaptations of other animals or plants that are specifically bred by humans. They could also look at some extreme habitats and how the animals that live there have adapted to their environments. Learners could then discuss the ethics of selectively breeding racehorses and some breeds of dogs and reach a conclusion by giving the advantages and disadvantages of the process.