Selective ____, also called artificial selection, is the process by which ____ breed plants and animals for particular genetic ____. Humans have been doing this for ____ of years since they first bred food crops from wild plants and ____ animals. ____ breeding involves choosing parents with the ____ characteristic from a mixed ____. They are bred together. From the ____ those with the desired characteristic are bred ____. This continues over many ____ until all the offspring show the desired characteristic. The characteristic can be chosen for ____ or appearance and include features such as disease or drought ____ in food crops as well as large or unusual ____ with beautiful colors. Animals which produce ____ meat, milk, eggs or fur. Domestic dogs with a ____ nature or appealing looks. Unfortunately, if not done ____, selective breeding can lead to ____ where some breeds are ____ prone to disease or ____ defects.

Selective Breeding

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？