Sexual reproduction refers to the reproductive mode in which bisexual reproductive cells (such as sperm and egg cells) combine to form a fertilized egg, and then the fertilized egg develops into a new individual, which is called sexual reproduction. However, the cloned sheep only extracted the somatic cell nucleus of one sheep (1), extracted the egg cell of another sheep (2), peeled off the nucleus, put the nucleus of 1 into the seedless egg cell of 2, and then put it into the uterus of No.3 sheep for development and growth, and finally cloned sheep was born. In this process, there is obviously no combination of bisexual germ cells.