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基因型为aa的牛与杂种公牛表现有角杂种母牛与基因型为aa的牛表现为无角现在一对有角牛交配生下一只无角牛这种牛的性别是a．雄牛 b．雌牛 Template






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sketch 3575 Stitch by Laura Gutierrez Hinojosa
sketch 5259
sketch 4710
sketch 2813 Stan from South Park by Amer Amimer
sketch 5052 Gorillaz by Rafał Dawid
sketch 1153 sahib
sketch 4724 Turtwig by Mark Robson
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sketch 5212 Katy Perry by Shahid Khokhar
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sketch 5059 Edward Hopper&#;s &#;Nighthawks&#; by Rosanne Zammit
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tomski基因型为aa的牛与杂种公牛表现有角杂种母牛与基因型为aa的牛表现为无角现在一对有角牛交配生下一只无角牛这种牛的性别是a．雄牛 b．雌牛 coloring
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