一对等位基因经某种限制性核酸内切酶切割后形成的DNA片段长度存在

一对等位基因经某种限制性核酸内切酶切割后形成的DNA片段长度存在差异,凝胶电泳分离酶切后的DNA片段,与探针杂交后可显示出不同的带谱。根据该特性,就能将它作为标记定位在基因组的某一位置上。现有一对夫妇生了四个儿女,其中1号性状特殊(如下图),由此可推知这四个儿女的基因型(用D、d表示)正确的是              (  )

A.1号为XdXd                    B.2号为XDY

C.3号为Dd                      D.4号为DD

 

答案

CD

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