题目

Every object tells a story . Even the most ordinary objects can present to us powerful images （形象）.Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary. Such is the case with an old leather（皮革）shoe in a museum in Alaska .At first glance it does not look like much .It is a woman’s shoes of a style popular in the 1890s. But what is unique（独特的）about this shoes is where it was found .It was discovered on the Checkout Pass, the famous trail（路线）used by the people seeking gold in Alaska. Who it belonged to or why it was lef科研人员选择选择不同性状的果蝇进行实验（控制性状的显、隐性基因用A、a表示），结果如下表。请回答下列问题：组合亲代性状子代长翅数量子代残翅数量1长翅×长翅40602长翅×长翅3971353长翅×残翅1701684残翅×残翅0315⑴果蝇的长翅和残翅是一对____________。⑵根据表中第_______组结果可以判断出显性性状是 _______。⑶组合1的子一代基因组成是_______________。 组合3亲代的基因组成分别是_______、_______，组合2的子代长翅中含a基因的个体占的比例是_____。