Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, all in the same species, have descended from wolves. This process is referred to as_______

Intentional breeding or selective breeding is the intentional breeding of plants and animals. It is utilised to breed the domestic animals with the desired traits. Hence the animal with desired qualities are chosen for the breeding. Selective breeding can also lead to inbreeding and loss of fertility and to prevent this many breeds are back crossed or out crossed to wild-type individuals. It can be unintentional also such as the domestication of crops by early humans happened unintentionally. The varieties of dogs like Chihuahua and Great Dane clearly show the desired traits that can be achieved by selective breeding.