Giao phoi la thuat ngu sinh hoc chi ve su ket hop cua cac sinh vat khac gioi hoac luong tinh, thuong cho muc đich sinh san huu tinh. Thuat ngu giao phoi con đuoc goi bang nhieu ten khac nhau trong nhung hoan canh khac nhau va pham vi khac nhau nhu giao cau (hanh vi sinh duc, quan he sinh ly nhung khong nhat thiet vi muc đich sinh san) hay phoi giong hay nhan giong (dung cho ngu canh chi ve đong vat, nhan giong vat nuoi) hoac giao hop hay lam tinh (chi ve quan he tinh duc o nguoi).
Trong tieng Anh, tu giao phoi hay Mating con la đinh nghia gioi han thuat ngu ghep noi (su an khop vua van) giua cac loai đong vat va cac đinh nghia khac mo rong thuat ngu giao phoi o thuc vat va o gioi nam. Thuat ngu giao phoi cung đuoc ap dung cho cac qua trinh lien quan o vi khuan, vi khuan co va vi rut. Giao phoi trong nhung truong hop nay lien quan đen viec ghep cap cac ca the (ghep đoi), kem theo viec ghep cap nhiem sac the tuong đong cua chung va sau đo trao đoi thong tin ve bo gen dan đen su hinh thanh the he con tai to hop (xem he thong giao phoi).
Su thu tinh la su hop nhat cua ca te bao sinh duc hoac giao tu. Su giao phoi hay giao hop la su ket hop cua cac co quan sinh duc cua hai đong vat sinh san huu tinh đe thu tinh va thu tinh trong sau đo. Giao phoi cung co the dan đen viec thu tinh ngoai o nhieu loai đong vat bac thap, nhu đuoc thay o đong vat luong cu, ca va thuc vat. Đoi voi phan lon cac loai, giao phoi la giua hai ca the khac gioi. Tuy nhien, đoi voi mot so loai luong tinh, khong can phai giao hop vi sinh vat bo me co kha nang tu thu tinh (autogamy) vi du nhu sen chuoi.


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