... 40% - 30% = 10% ; U m = 30% - 10% = 20% Am = 100 % 0,25 (Gm + Xm + U m) = 100 % - (30% +10% +20%) = 40% - Tng s nucleotit ca mARN= 40x900 = 360 nucleotit, 100 10x900 = = 90 nucleotit, 100 - Am = (2,25) ... HNG DN CHM V P N THI TUYN SINH VO LP 10 THPT NM HC 2012-2013 MễN THI: SINH HC (CHUYấN) (ỏp ỏn gm 04 trang) Cõu Ni dung im a/ Hu qu ca t bin ... th cỏc sinh cnh khỏc cú s trao i vt n tht v mi nhiu qun xó a/ c trng ca qun th ngi v qun th sinh vt: - c trng cú c qun th ngi v qun th sinh vt: t l gii tớnh, thnh phn nhúm tui, mt , sinh sn,...