什么是近交?近交的遗传效应是什么?
参考答案:
交配的双方有较近亲缘关系的叫近亲交配,叫近交。
效应:
1固定优良性状
2揭露有害基因
3保持优良个体血统
.She had a guilty________ about not telling the police what had actually happened.
A.consciousness
B.conscience
C.consequence
D.confusion
钢筋混凝土结构中,16代表直径为16mm的何种钢筋()。
A.HPB235
B.HRB335
C.HRB400
D.RRB400