A.The list appears on the man's desk. B.The man says he has to buy some things. C.The man has made some mistakes in the list. D.The handwriting is identical to the man's.
【简答题】玉米的紫株和绿株由 6 号染色体上一对等位基因( H , h )控制,紫株对绿株为显性。纯合紫株 A 经 X 射线照射后再与绿株杂交,子代出现少数绿株(绿株 B )。为研究绿株 B 出现的原因,让绿株 B 与正常纯合的紫株 C 杂交得 F 1 , F 1 自交得 F 2 。请回答: ( 1 )假设一: X 射线照射导致紫株 A 发生了基因突变。若此假设成立,则 F 1 的基因型为 ________...