遗传率h2: The proportion of the causation of a character that is due to genetic causes MZ DZ 100--CDZ If Cmz>> cpz then h is high(approaches 1) If c Mz- Cpz then his low(approaches 0 C= concordance发病一致性(same, identical) MZ=同卵双生子 DZ=异卵双生子遗传率 (h 2 ): The proportion of the causation of a character that is due to genetic causes CMZ -- CDZ • h 2 = ----------------------- 100 -- CDZ • If cMZ >> cDZ then h 2 is high (approaches 1) • If cMZ = cDZ then h 2 is low (approaches 0) C = concordance发病一致性（same，identical） MZ = 同卵双生子 DZ = 异卵双生子