The diagram shows the breeding of two parental pig breeds to produce the Modern Duroc pig - Scottish Highers Biology - Question 21 - 2019

The breeding illustrated between the Brown Duroc and Jersey Red pigs to produce the Modern Duroc pig is an example of cross breeding. Cross breeding occurs when two different breeds are mated to combine specific traits from both parental breeds. This approach often results in offspring that can exhibit improved qualities, such as the increased quality and quantity of meat seen in the Modern Duroc pig, enhancing traits from both parent breeds.