【试题】柑橘果实果皮色泽是由两对等位基因控制(用A、a和B、b表示)。为探明柑橘果皮色泽的遗传特点,科研人员利用果皮颜色为黄色、红色和橙色的三个品种进行杂交实验.并对子代果皮颜色进行了调查测定和统计分析,实验结果如图。若单株收获实验丁F。红色柑橘自交后代F_2中红色果实的种子.每株的所有种子单独种植在一起得到一个株系。观察多个这样的株系,则所有株系中,理论上F_3果皮 【Questions】 citrus fruit peel color is controlled by two pairs of alleles (with A, a and B, b said). In order to find out the genetic characteristics of the color of citrus peel, the researchers conducted the hybridization experiment using three varieties with yellow, red and orange peel, and investigated and statistically analyzed the color of offspring pericarp. The experimental results are shown in the figure. If the individual harvest experiment Ding F. Red citrus Self-progeny F_2 Middle-red fruit seeds All the seeds of each plant were planted together to obtain a single strain. Looking at a number of such strains, in all strains, theoretically F_3 peels