Selective breeding
The technique of selective breeding is used to cross breed crops and animals have high quality of traits to get hybrids with the most desirable traits.
This technique has been used for a long time without detailed informati and knowledge about genetics.
Nowadays. plants such as wheat, oil palm, and rice and animals such as cow and sheep are improved with desired traits by selective breeding
For example, dairy cows are bred to produce larger quantities of milk.
Many varieties of fruits and vegetables are cultivated to resist diseases and pests.