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Gaokao Biology Practice Question

5.(6分)某种二倍体高等植物的性别决定类型为XY型。该植物有宽叶和窄叶两种叶形, 宽叶对窄叶为显性。控制这对相对性状的基因(B/b)位于X染色体上,含有基因b的花 粉不育。下列叙述错误的是()

  1. A.窄叶性状只能出现在雄株中,不可能出现在雌株中
  2. B.宽叶雌株与宽叶雄株杂交,子代中可能出现窄叶雄株
  3. C.宽叶雌株与窄叶雄株杂交,子代中既有雌株又有雄株
  4. D.若亲本杂交后子代雄株均为宽叶,则亲本雌株是纯合子

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