豚鼠的黑体色对白体色是显性。当一只杂合的黑色豚鼠和一只白豚鼠杂交时，产生出生的子代是三白一黑，以下对结果的合理解释是（）_刷题宝

题干

豚鼠的黑体色对白体色是显性。当一只杂合的黑色豚鼠和一只白豚鼠杂交时，产生出生的子代是三白一黑，以下对结果的合理解释是（）

A：等位基因没有分离

B：这种杂交的比率是3∶1

C：子代在数目小的情况下，常常观察不到预期的比率

D：减数分裂时，肯定发生了这对等位基因的互换

上一题下一题 0.0难度选择题更新时间:2011-04-02 09:38:44

答案(点此获取答案解析）

C

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