题目

— The concert was wonderful yesterday. Didn’t you go to it? — _______. I _______, but I had to look after my sick baby at home. A. No; would love to have    B. No; would love to C. Yes; would love to        D. Yes; would love to have 答案：A基因型为YyRr（♂）×YyRR（♀）的两黄色圆粒豌豆杂交，下列叙述正确的是(      )A．杂交需要人工授粉B．子代有9种基因型C．子代表现出3 : 1的性状分离比D．基因遗传不符合自由组合定律