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Gaokao Biology Practice Question

某研究小组从野生型高秆（显性）玉米中获得了2个矮秆突变体，为了研究这2个突变体的基因型，该小组让这2个矮秆突变体（亲本）杂交得F1，F1自交得F2，发现F2中表型及其比例是高秆:矮秆:极矮秆=9:6:1。若用A、B表示显性基因，则下列相关推测错误的是（ ）

  1. A.亲本的基因型为aaBB和AAbb，F1的基因型为AaBb
  2. B.F2矮秆的基因型有aaBB、AAbb、aaBb、Aabb，共4种
  3. C.基因型是AABB个体为高秆，基因型是aabb的个体为极矮秆
  4. D.F2矮秆中纯合子所占比例为1/2，F2高秆中纯合子所占比例为1/16

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