题目

I work as a volunteer for an organization that helps the poor in Haiti. Recently I took my son Barrett there for a week, hoping to   41   him. Before setting out, I told Barrett this trip would be tiring and   42  . For the first two days, he said almost nothing. I worried the trip was too   43   for a 17-year-old. Then, on day three, as we were   44   over high rocky mountains, he turned to me and grinned(咧嘴笑),“Pretty hard.” After that there was no turning back. A five-year-old girl, wearing a dress several sizes   45   large and broken shoes, followed Ba玉米的甜味和非甜味为一对相对症状，有人将纯合甜味和纯合非甜味玉米同行种植，如图所示，且雌蕊接受同株和异株花粉的机会相等，请回答以下问题：（1）请通过分析各行玉米的种子性状，判断甜味和非甜味的显隐性关系：①若A、C行的植株种子是 ，B、D行的植株种子是 ，则甜味是显性．②若A、C行的植株种子是 ，B、D行的植株种子是 ，则非甜味是显性．（2）若非甜味是显性，现将B行植株的种子发育成的新个体（F1）进行随机交配，则所得种子的甜味与非甜味比例是 ．（3）玉米的长节（G）对短节（g）是显性，胚乳的紫色（E）对白色（e）是显性，现将某两植株杂交，子代性状类型及数量统计如图，请回答有关问题。①亲本的基因型分别为 、 。②将F1中的长节紫色植株与短节白色植株杂交，则后代长节紫色植株的概率是 。