asexual reproduction      
noun [ U ]  biology specialized uk/eɪˈsek.ʃu.əl riː.prəˌdʌk.ʃən/ us/eɪˈsek.ʃu.əl riː.prəˌdʌk.ʃən/
 无性生殖
a method of producing new young plants or animals from a single plant or animal and without separate male and female cells joining together