题目

    A group of people from Denmark have formed the B-Society. According to them, human beings are divided into types: A-People, and B-People. A-People have no problem getting up in the morning, and operate much better earlier in the day. However, B-people are better later in the day. “I’m useless early in the morning,” says one of the members of the B-Society.”All I can do is drink coffee, and stare into space. People used to get up early because they had to feed the animals. But I haven’t got any cows or chickens, so I can sleep late,” She adds. Since the society was se1．西红柿为自花授粉的植物，已知果实颜色有黄色和红色，果形有圆形和多棱形．控制这两对性状的基因分别位于两对同源染色体上．根据下表有关的杂交及数据统计，回答问题：亲本组合后代表现型及株数组别表现型红色圆果红色多棱果黄色圆果黄色多棱果Ⅰ红色多棱果×黄色圆果531557502510Ⅱ红色圆果×红色多棱果720745241253Ⅲ红色圆果×黄色圆果603198627207据表回答：（1）上述两对相对性状中，据组合Ⅱ判断果实颜色红色为显性性状，据组合Ⅲ判断果形圆果为显性性状．（2）以A和a分别表示果色的显、隐性基因，B和b分别表示果形的显、隐性基因．请写出组别Ⅱ中两个亲本的基因型：AaBb和Aabb．（3）现有红色多棱果、黄色圆果和黄色多棱果三个纯合品种，育种家期望获得红色圆果的新品种，为此进行杂交．①应选用哪两个品种作为杂交亲本较好？红色多棱和黄色圆果．②上述两亲本杂交，产生的F1代的基因型为AaBb．③上述F1自交得F2，在F2代中，表现型为红色圆果的植株出现的比例为$\frac{9}{16}$，其中能稳定遗传的红色圆果又占该表现型的比例为$\frac{1}{9}$．