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【简答题】
现有某XY型性别决定的多年生观赏植物，发现其抗除草剂对不抗除草剂为显性，由常染色体上的A和a基因控制；花瓣单色对彩色为显性，由X染色体上的B和b基因控制；另有耐盐基因位于线粒体DNA上。 (1)验证花色和耐盐基因所在的位置，常用的遗传实验方法是________。 (2)现有以下纯种植株若干： 甲：不抗除草剂彩色耐盐雄株   乙：不抗除草剂彩色不耐盐雄株 丙：抗除草剂单色不耐盐雌株   丁：抗除草剂单色耐盐雌株 请利用上述四种植株(甲～丁)，通过杂交育种培育抗除草剂、彩色、耐盐的雌雄植株： 第一年：可用作亲本的杂交组合是______________； 第二年：从子一代植株中选取表现型为___________的植株和甲～丁中的_________杂交； 第三年：从子二代植株中选出抗除草剂彩色耐盐的雌雄植株。其中选出的雄株核基因的基因型为_____。
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