Selective Breeding in Animals (Edexcel IGCSE Biology (Modular))
Revision Note
Selective Breeding in Animals
Selective breeding in animals is a similar process to selective breeding in plants
Individuals with the desired characteristics are bred together (often several different parents all with the desired characteristics are chosen so siblings do not have to be bred together in the next generation)
Offspring that show the desired characteristics are selected and bred together
This process is repeated for many successive generations
Animals are commonly selectively bred for various characteristics, including:
Cows, goats and sheep that produce lots of milk or meat
Chickens that lay large eggs
Domestic dogs that have a gentle nature
Sheep with good quality wool
Horses with fine features and a very fast pace
An example of an animal that has been selectively bred by humans in many ways to produce breeds with many different characteristics is the domestic dog, all breeds of which are descended from wolves:
Selective breeding has produced many different breeds of domestic dog
Natural selection vs artificial selection table
Natural selection | Artificial selection |
|---|---|
Occurs naturally | Only occurs when humans intervene |
Results in development of populations with features that are better adapted to their environment and survival | Results in development of populations with features that are useful to humans and not necessarily useful to the survival of the individual |
Usually takes a long time to occur | Takes less time as only individuals with the desired features are allowed to reproduce |
Examiner Tips and Tricks
Make sure that you include the need to repeat the selective breeding process for many generations in any exam answer you give – selecting two parents with desired characteristics, breeding them and stopping there is not selective breeding and will not give rise to a new breed.
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