Selective breeding is the traditional method for improving crops and livestock, such as increasing disease resistance or milk yield. Natural selection and selective breeding can both cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but selective breeding only occurs when humans intervene.
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Natural selection and selective breeding
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Selective breeding or artificial selection is when humans breed plants and animals for particular genetic characteristics. Humans have bred food crops from wild plants and domesticated animals for thousands of years. Selective breeding takes place over many generations. These are the main steps for both plants and animals:. Highland cows have been bred for their meat. Friesian cows have been bred to produce large volumes of milk. Aberdeen Angus cows have also been bred for their meat. Farmers selectively breed different types of cows with highly desirable characteristics in order to produce the best meat and dairy. Characteristics can be chosen for usefulness or appearance. Desired characteristics in plants:.